From Longman Dictionary of Contemporary Englishinfinityin‧fin‧i‧ty /ɪnˈfɪnəti/ noun 1 [uncountable]LIMIT a space or distance without limits or an end the infinity of space2 [singular, uncountable]HM a number that is too large to be calculated In the equation below, as E goes to zero, n approaches infinity.infinity of There is an infinity of possible solutions.