reflection
gb/ɹɪflˈɛkʃən/ us/ɹɪflˈɛkʃən/
A2
英語
~ 7300
語義
0件の語義
名詞
A2
entity
1
image you see in a mirror
The picture of a person or thing that you see in a mirror, glass, or water.
用法パターン：
to see [someone]'s reflection in [something]
よくある間違い：
Learners sometimes confuse 'reflection' with 'shadow'. A reflection is an image you see in a mirror or shiny surface, while a shadow is a dark shape on a surface caused by light being blocked.
類義語
image (A general word for a picture or appearance; it does not always suggest a mirror or shiny surface like 'reflection' does.)
対義語
original (The real person or object, as opposed to the copied image you see as a reflection.)
コロケーション
see your reflection
|mirror reflection
|reflection in the water
|clear reflection
|distorted reflection
テーマ
daily life
|visual
|appearance
|daily_life
|science
|core_vocabulary
例文
- She caught her reflection in the shop window and quickly fixed her hair.
- The mountains looked beautiful in the lake’s calm reflection.
- I could barely see my reflection in the scratched old mirror.
- His reflection in the glass door made him look much taller.
- The bright lights on the stage created strange reflections in her glasses.
学習者向け例文
- I looked at my reflection in the mirror.
- You can see the trees in the water’s reflection.
- The glass is dirty, so my reflection is not clear.
- He smiled when he saw his reflection in the window.
- The moon’s reflection shines on the river at night.
名詞
B2
action
2
careful thought about something
When you think slowly and carefully about something, usually an important idea, choice, or experience.
用法パターン：
after (some) reflection, [clause]
よくある間違い：
Learners sometimes use 'thinking' instead of 'reflection' in set phrases like 'after some reflection' or 'on reflection'. While 'after thinking' is understandable, 'after some reflection' sounds more natural and formal in writing and careful speech.
類義語
consideration (Sounds slightly more formal and often focuses on weighing choices, while 'reflection' can be more personal and about feelings or lessons.)
対義語
impulse (Acting on impulse means acting suddenly without reflection or careful thought.)
コロケーション
after some reflection
|on reflection
|deep reflection
|time for reflection
|period of reflection
テーマ
thinking
|decision-making
|emotions
|education
|core_vocabulary
例文
- After much reflection, she decided to move abroad for work.
- The trip gave him time for reflection about what he really wanted in life.
- On reflection, I think we should have listened to her advice.
- The speech prompted serious reflection on how we treat the environment.
- Moments of quiet reflection can help reduce stress and worry.
学習者向け例文
- After some reflection, I changed my plan.
- The holiday gave me time for reflection.
- On reflection, I was wrong to shout at him.
- She sat in reflection before making her choice.
- Reflection helped him understand his mistakes.
名詞
B2
entity
3
something that shows qualities clearly
Something that shows what a person, group, or thing is really like, often used to judge it as good or bad.
用法パターン：
[something] is a [good/bad] reflection on [someone/something]
よくある間違い：
Learners often say 'reflection to' instead of 'reflection of' or 'reflection on'. Use 'a reflection of' to show what something is like, and 'a reflection on' to talk about how something affects a person’s or group’s reputation.
類義語
indication (A general word for a sign; 'reflection' suggests a closer, more direct connection to the quality being judged.)
対義語
misrepresentation (A misrepresentation gives a false picture, while a reflection (in this sense) is understood as accurately showing the real qualities.)
コロケーション
a reflection of society
|true reflection of
|fair reflection of
|poor reflection on
|bad reflection on
テーマ
evaluation
|reputation
|society
|communication
|relationships
|core_vocabulary
例文
- The high crime rate is a sad reflection of the city’s social problems.
- Her kindness is a true reflection of her character.
- The dirty tables are a bad reflection on the restaurant’s management.
- The exam results are not an accurate reflection of the students’ abilities.
- The team’s success is a positive reflection on the new coach.
学習者向け例文
- His work is a reflection of his talent.
- The bad service is a poor reflection on the hotel.
- These rules are a reflection of our values.
- The report is not a true reflection of the facts.
- Your behavior is a bad reflection on the company.
名詞
formal
B2
entity
4
written or spoken thoughtful comments
Careful thoughts or ideas that a person writes or talks about, usually in a personal way.
用法パターン：
[someone]'s reflections on [topic]
よくある間違い：
Learners sometimes confuse this sense with a simple 'summary' or 'report'. A summary tells what happened; reflections explain what you think or feel about what happened and what it means.
類義語
meditations (Often more spiritual or philosophical; 'reflections' can be academic, personal, or everyday.)
対義語
report (A report focuses on facts and information, while reflections focus on personal thoughts and feelings about those facts.)
コロケーション
personal reflections
|reflections on life
|reflections on experience
|brief reflections
|collected reflections
テーマ
writing
|thinking
|education
|communication
|arts_entertainment
例文
- The book is a collection of her reflections on travel and identity.
- Students are asked to write brief reflections after each class.
- His reflections on aging were both honest and moving.
- The article ends with the author’s reflections on the future of work.
- Her reflections on the project helped the team improve their next plan.
学習者向け例文
- I wrote my reflections on the movie for homework.
- The teacher asked us to share our reflections on the story.
- This blog is full of her reflections on daily life.
- He shared some reflections on his first year at university.
- In my reflections, I talk about what I learned.
名詞
technical
C1
event
5
bouncing back of light or sound
When light, sound, or other waves hit a surface and then go back instead of passing through or staying in it.
用法パターン：
the reflection of [light/sound] from [a surface]
よくある間違い：
Learners may mix 'reflection' with 'refraction'. Reflection is when waves bounce back from a surface; refraction is when waves bend as they pass into a different medium.
類義語
bounce (Informal and general; in physics, 'reflection' is the precise technical term for this 'bounce' of waves.)
対義語
absorption (Absorption happens when waves are taken in by a material instead of being reflected back.)
コロケーション
light reflection
|sound reflection
|angle of reflection
|law of reflection
|total internal reflection
テーマ
science
|physics
|technology
例文
- The mirror’s smooth surface allows almost perfect reflection of light.
- In this experiment we measure the reflection of sound from different materials.
- The law of reflection states that the angle of incidence equals the angle of reflection.
- Coatings on glasses reduce the reflection of light and prevent glare.
- Radar works by sending out signals and detecting their reflection from objects.
学習者向け例文
- Reflection happens when light hits a mirror and goes back.
- We studied the reflection of sound in physics class.
- The angle of reflection is the same as the angle of incidence.
- Walls with soft material reduce reflection of noise.
- The strong reflection of the sun made it hard to see.
名詞
technical
C1
action
6
flipping a shape over a line
In math, a change that turns a shape into its mirror image across a line or a flat surface.
用法パターン：
the reflection of [a shape] across [a line/plane]
よくある間違い：
Learners sometimes confuse 'reflection' with 'rotation' or 'translation'. A reflection always makes a mirror image across a line or plane, while rotation turns the shape and translation just moves it without turning.
類義語
flip (An informal classroom term for turning a shape over; 'reflection' is the precise mathematical term.)
対義語
rotation (A different geometric transformation that turns a shape without flipping it into a mirror image.)
コロケーション
line of reflection
|reflection across the y-axis
|horizontal reflection
|vertical reflection
テーマ
math
|geometry
|education
|science
例文
- Draw the reflection of the triangle across the vertical line.
- In this exercise, each point is mapped to its reflection in the x-axis.
- A reflection in geometry keeps the same size and shape but changes orientation.
- The teacher showed how a reflection can create mirror symmetry.
- We found the line of reflection between the original figure and its image.
学習者向け例文
- In geometry, we can move a shape by reflection.
- The reflection of the square across the line looks like a mirror image.
- Each point goes to its reflection on the other side of the line.
- A reflection changes the side of the shape but not its size.
- We drew a line of reflection and flipped the shape over it.
文法
辞書形
reflection
IPA
GB/ɹɪflˈɛkʃən/
US/ɹɪflˈɛkʃən/
音節・強勢
re - flec - tion （3音節）
Stress on 2nd syllable (flec)
活用形
Noun
- Base: reflection
- Plural: reflections
関連語
Forms
reflections
noun
Core family
reflect
verb B1
reflective
adjective B2
Related words
reflectively
adverb
reflector
noun
Negative and opposite forms
unreflective
adjective
Advanced or less common
reflectivity
noun
表現
a reflection of
1/ə ɹɪflˈɛkʃən əv/
fixed phrase
something that shows what something is like
Used to say that one thing clearly shows what another thing, person, or situation is really like.
例文
- The rise in prices is a reflection of the growing demand.
- Her success is a reflection of her hard work.
- The film is a reflection of the fears of that time.
a reflection on
1/ə ɹɪflˈɛkʃən ˈɔn/
fixed phrase
something that affects reputation or judgment
Used to say that something makes a person or thing look good or bad in other people’s opinion, often negative.
例文
- The rude staff are a bad reflection on the company.
- Your behavior at the meeting was a poor reflection on you.
- The dirty streets are a sad reflection on the city government.
on reflection
1/ˈɔn ɹɪflˈɛkʃən/
fixed phrase
after thinking carefully about it
Used to say that you changed your opinion or decision after thinking carefully.
例文
- On reflection, I realized that taking the job would have been a mistake.
- He agreed to help, but on reflection he decided it was too risky.
- On reflection, the committee chose the cheaper option.
self-reflection
1/sˈɛlf ɹɪflˈɛkʃən/
fixed phrase
thinking carefully about yourself
The act of looking at your own thoughts, feelings, and actions to understand yourself better.
例文
- Therapy encouraged him to practice regular self-reflection.
- Self-reflection can help you learn from your mistakes.
- The course includes activities that support self-reflection and personal growth.
upon reflection
1/əpˈɑn ɹɪflˈɛkʃən/
fixed phrase
formal
after careful thought (formal)
A formal way to say 'after thinking carefully about something'.
例文
- Upon reflection, the judge reduced the sentence.
- The company, upon reflection, admitted that it had made an error.
- Upon reflection, she felt her first reaction had been unfair.