Relating to or characterized by assertion; making or inclined to make strong claims or statements.
From 'assert' (Latin 'asserere', to claim) plus the suffix '-ative' (from Latin '-ativus'), which creates adjectives meaning 'tending to' or 'relating to' an action. A rare synonym for 'assertive.'
'Assertative' is almost entirely replaced by 'assertive' in modern English, but philosophers and logicians kept using it in technical contexts—it shows how '-ative' and '-ive' often compete as suffixes, and '-ive' tends to win out because it's shorter and easier to say.
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