Word parts definite + -ly Pronunciation IPA (key): /dɛf.ɪnət.li/ Audio (US)(file) Adverb Positive definitely Comparative more definitely Superlative most definitely Something that will definitely happen will happen without doubt or with great chances of occurring. The letter will definitely come this week. There's a 100% chance of rain tomorrow. It will definitely rain. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads