Things that complete or enhance each other when combined, or the full number required to make something complete. In grammar, words or phrases that complete the meaning of a predicate.
From Latin 'complementum' meaning 'that which fills up,' from 'complere' (com- 'completely' + plere 'to fill'). Entered English in the 14th century, with specialized meanings developing in various fields like mathematics, grammar, and biology.
The beauty of complements lies in their mathematical precision - they don't just work well together, they complete each other to form a perfect whole, like puzzle pieces that were always meant to fit together.
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