Noun | 1. 7 - the cardinal number that is the sum of six and oneheptad, septenary, septet, seven, sevener, VIIdigit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits" | Adj. | 1. 7 - being one more than six seven, viicardinal - being or denoting a numerical quantity but not order; "cardinal numbers" |