complementary
C1Formal/Neutral
Definition
Meaning
Combining well to form a whole, each supplying what is lacking in the other; relating to a relationship of mutual completion.
Used in various contexts to describe things (e.g., skills, colors, services, theories) that, when combined, enhance each other's qualities or create a balanced, effective whole. In business, it often refers to products that are consumed together.
Linguistics
Semantic Notes
Focus on mutual benefit and enhancement. Not synonymous with 'free' (a common confusion with 'complimentary'). The core idea is synergy, not just similarity.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning or usage. Spelling is consistent.
Connotations
Slightly more common in formal/academic registers in both varieties.
Frequency
Comparable frequency; slightly higher in academic texts.
Vocabulary
Collocations
Grammar
Valency Patterns
be complementary toform a complementary pair withsee X and Y as complementaryVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Describes products/services that are bought together (e.g., printers and ink) or team skills that combine effectively.
Academic
Used in various fields: linguistics (complementary distribution), physics (complementary properties), medicine (complementary therapies).
Everyday
Often used to describe colours that look good together or two people's skills that balance well.
Technical
In colour theory, colours opposite each other on the colour wheel. In mathematics, angles summing to 90 degrees.
Examples
By Part of Speech
adjective
British English
- The two researchers have highly complementary areas of expertise.
- They offer complementary therapies alongside conventional medicine.
American English
- Their skill sets are perfectly complementary for this project.
- The software provides features complementary to our main platform.
Examples
By CEFR Level
- Blue and orange are complementary colours.
- The two friends have complementary personalities.
- The new policy is designed to be complementary to existing regulations.
- Their research approaches, though different, are complementary.
- The economist discussed the role of complementary goods in consumer demand elasticity.
- Quantum mechanics posits complementary properties that cannot be measured simultaneously.
Learning
Memory Aids
Mnemonic
Think of a **COMPLETE** mentary relationship – two parts that **COMPLETE** each other to form a whole.
Conceptual Metaphor
RELATIONSHIP AS A COMPLETE PICTURE (two pieces that complete the puzzle).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'комплиментарный' (a rare cognate). Avoid direct translation; the concept is more 'взаимодополняющий'.
- The English word is not a false friend of Russian 'комплимент' (a compliment). The spelling difference is crucial: COMPL**E**MENTARY vs. COMPL**I**MENTARY.
Common Mistakes
- Misspelling as 'complimentary' (meaning 'free' or 'flattering').
- Using it to mean 'the same' or 'similar' rather than 'differently completing'.
- Overuse in business jargon where 'related' or 'supporting' might suffice.
Practice
Quiz
Which of the following best illustrates a 'complementary' relationship?
FAQ
Frequently Asked Questions
'Complementary' means 'combining to form a complete whole'. 'Complimentary' means 'free' or 'expressing praise'. Remember: 'I' for 'free' or 'praise' (compl**I**mentary).
Yes, commonly. E.g., 'They are a great team because their skills are complementary.' It describes how different attributes combine effectively.
It is neutral to formal. It's common in academic, business, and technical writing. In everyday speech, people might use phrases like 'go well together' or 'balance each other out'.
A product whose demand increases when the demand for another related product increases (e.g., cars and petrol, computers and software).
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Precise Descriptive Language
C2 · 17 words · Highly precise adjectives and descriptors.
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