affirmation Get Printable Handwriting (af-fir-ma-tion) 4 syllables Learn It! Spelling Test Definition noun. the act of affirming something affirmed; positive declaration; assertionLaw a solemn declaration; but not under oath Example Sentence He gave his affirmation to move forward with the project. Synonyms yes; positive; approving; agreeing Antonyms negative Share with your friends: