eleventeen number3 •(informal) A nonsense number.Hobbes: Ooh, that's a tricky one. You have to use calculus and imaginary numbers for this. Calvin: Imaginary numbers?! Hobbes: You know, eleventeen, thirty-twelve, all those. — 1988 •(informal) A relatively large number, not precisely specified."He fitted about eleventeen thousand people last year." — 1919 •Twenty-one (21).