| Noun | 1. 8 - the cardinal number that is the sum of seven and oneeight, eighter, eighter from Decatur, octad, octet, octonary, ogdoad, VIIIdigit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits" | Adj. | 1. 8 - being one more than seven eight, viiicardinal - being or denoting a numerical quantity but not order; "cardinal numbers" |