The Collaborative International Dictionary of English v.0.48:
lxx \lxx\ adj. the Roman numeral representation of seventy; seven times ten; -- a determinate quantifier. Syn: seventy, 70. [WordNet 1.5]WordNet (r) 3.0 (2006):
lxx adj 1: being ten more than sixty [syn: seventy, 70, lxx] n 1: the cardinal number that is the product of ten and seven [syn: seventy, 70, LXX]