Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
complemental is an adjective meaning "acting as or providing a complement (something that completes the whole)". It carries one recorded sense.
acting as or providing a complement (something that completes the whole)
Definitions, synonyms and semantic relations for complemental come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.