in·fin·i·ty /inˈfinədē/ noun noun: infinity, plural noun: infinities 1. the state or quality of being infinite: "the infinity of space" synonyms: endlessness, infinitude, infiniteness, boundlessness, limitlessness, ... more an infinite or very great number or amount: "an infinity of combinations" synonyms: infinite number, great number, abundance, profusion, host, ... more a point in space or time that is or seems infinitely distant: "the lawns stretched into infinity" 2. a number greater than any assignable quantity or countable number (symbol ∞).