Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
assimilative is an adjective meaning "capable of mentally absorbing". It carries 2 recorded senses.
capable of mentally absorbing
“assimilative processes”
“assimilative capacity of the human mind”
capable of taking (gas, light, or liquids) into a solution
“an assimilative substance”
Definitions, synonyms and semantic relations for assimilative come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.