—v.t. 1. to change somewhat the form or qualities of; alter partially; amend: to modify a contract. 2. Gram.(of a word, phrase, or clause) to stand in a syntactically subordinate relation to (another word, phrase, or clause), usually with descriptive, limiting, or particularizing meaning; be a modifier. In a good man, good modifies man. 3. to be the modifier or attribute of.
4. to change (a vowel) by umlaut.
5. to reduce or lessen in degree or extent; moderate; soften: to modify one's demands.