Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ŏlĕĭtas, ātis, f. [olea], the olive-gathering, olive-harvest (ante- and post-class.): ubi vindemia et oleitas facta erit, Cato, R. R. 68; id. ib. 144; Minuc. Fel. 17, 9; Mamert. Grat. Act. 22.