the cardinal number that is the product of ten and three
<noun.quantity> [ adj ]
being ten more than twenty
<adj.all>
Thirty \Thir"ty\, a. [OE. thritty, AS. [thorn]r[=i]tig, [thorn]rittig; akin to D. dertig, G. dreissig, Icel. [thorn]rj[=a]t[=i]u, [thorn]rj[=a]tigi, [thorn]rir teger, Goth. [thorn]reis tigjus, i.e., three tens. See {Three}, and Ten, and cf. {Thirteen}.] Being three times ten; consisting of one more than twenty-nine; twenty and ten; as, the month of June consists of thirty days.
Thirty \Thir"ty\, n.; pl. {Thirties}. 1. The sum of three tens, or twenty and ten; thirty units or objects.
2. A symbol expressing thirty, as 30, or XXX.
A new client is shown around thirty basic styles from which he decides exactly what he wants.
I told my cabinet at that time that "we have six years to change what it took twenty or thirty to create _ and we came to Washington to make changes!"
Thought for today: "(Age) thirty _ the promise of a decade of loneliness, a thinning list of single men to know, a thinning briefcase of enthusiasm, thinning hair." _ From "The Great Gatsby" by F. Scott Fitzgerald (1896-1940).
"Twenty or thirty years ago, they were all over, flocks of them coming in and out.