n. & adj.
n. (pl. thousands or (in sense 1) thousand) (in sing. prec. by a or one) 1 the product of a hundred and ten. 2 a symbol for this (1,000, m, M). 3 a set of a thousand things. 4 (in sing. or pl.) colloq. a large number.
adj. that amount to a thousand. thousandfold adj. & adv. thousandth adj. & n.
[ OE thusend f. Gmc ]