Mere can be an adjective meaning nothing more than specified, or a noun meaning a small lake or pond. Learn the origin, usage and synonyms of mere from various dictionaries and sources. The meaning of MERE is being nothing more than. How to use mere in a sentence. Mere is an adjective that can mean small, unimportant, or insignificant, or that something small has a big effect or influence. Learn how to use mere in different contexts and examples with Britannica Dictionary. Master the word "MERE" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource.