a cardinal number, 6 plus 1.

a symbol for this number, as 7 or VII.

a set of this many persons or things.

a playing card with seven pips.

sevens, ( used with a singular verb ) fan-tan ( def. 1 ) .

amounting to seven in number. ?

seven out, crap 2 ( def. 3a ) .

adjective

septemviral , septenary , septennial , septuple

noun

hebdomad , heptad , heptade , septenary , septuplicate