† illegitime,a.Obs.rare. [a. F. illégitime (15th c.), ad. L. illēgitimus, f.il- (il-2) + lēgitimus legitimate.] = illegitimate a. 1502Ord. Crysten Men iv. xxi. (1506) 234 If he were..bygame, illegittime, or concubinarie.1669Gale Jansenism 72 This Ordinance is neglected by all as illegitime.