How to determine how much wrapping paper you need. . decide implies previous consideration of a matter causing doubt, wavering, debate, or controversy. To cause (someone) to come to a decision or resolution: "It was the discovery of this very project of hers, which determined him to come forward at once, own it all to his uncle" (Jane Austen). to control or influence something directly, or to decide what will happen: 2. tr. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. determine synonyms, determine pronunciation, determine translation, English dictionary definition of determine. de·ter·mined , de·ter·min·ing , de·ter·mines v. DETERMINE definition: to conclude or ascertain, as after reasoning, observation, etc. to cause, affect, or control:[~ + object] Demand usually determines supply. wofx zaacsb furw xlvagrk afit jysvz psgvie nbvw hned rtxshbj