This room is really hot. That's really interesting. It's a really difficult decision. "Did you like it? Not really (= no)."

Adverb really (comparative more really, superlative most really) (literal) In a way or manner that is real, not unreal.

Really is the only correct spelling in English across American, British, and global usage. The incorrect form realy appears due to typing speed, habit, or uncertainty about English spelling rules.

Definition of really adverb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

WordReference Random House Learner's Dictionary of American English © 2026 re al ly /ˈriəli, ˈrili/ adv. actually: sees things as they really are. genuinely; truly: a really hot day. indeed: Really, this is too much. interj. (used to express surprise, scolding, disapproval, etc.): Really, be serious! See -real-.

Define really. really synonyms, really pronunciation, really translation, English dictionary definition of really. adv. 1. In actual truth or fact: There isn't really a lake there; it's just a mirage.

Definition of REALLY in the Definitions.net dictionary. Meaning of REALLY. What does REALLY mean? Information and translations of REALLY in the most comprehensive dictionary definitions resource on the web.

REALLY definition: 1. in fact: 2. used to say that something is certain: 3. very or very much: . Learn more.

The Origin of “Really” The word really comes from the adjective real, which entered English from Latin realis, meaning true or actual. Over time, English added -ly to turn real into an adverb: really (meaning truly or very). The spelling includes two Ls because: real + -ly = really The incorrect spelling “realy” usually appears because people drop one L when typing quickly or sounding ...