Complementary vs. Complimentary
“Complementary” and “complimentary” sound alike but have different meanings. “Complementary” describes things that complete or work well with each other, while “complimentary” can mean praising or given free of charge.
Use “complementary” when two things work well together; use “complimentary” for praise or something provided free.
Key details
Choose the right form
| If you mean / need | Use | Why |
|---|---|---|
| things that complete or suit one another | complementary | It is related to complement. |
| praise or something given free | complimentary | It is related to compliment or the “free of charge” sense. |
Further guidance
Core difference
Use “complementary” for things that fit together or complete one another. Use “complimentary” for praise or for something given free of charge.
Fast Test
Think “complement” for completion and “compliment” for praise. If a hotel gives you a free breakfast, it is complimentary.
Meaning Boundary
“Complimentary” has two common senses—praising and free—so context determines which one is intended.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Complementary — English meaning (opens in a new tab)Cambridge University Press · Dictionary meaning of complementary as working well together or completing another thing
- Complimentary — English meaning (opens in a new tab)Cambridge University Press · Dictionary meanings of complimentary as praising or provided free of charge