Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
plēbĭtas, ātis, f. [plebs], the rank of a common citizen, plebeian rank or condition (ante-class.): propter tenuitatem, et plebitatem, Cato ap. Non. 149, 4: Hemina, id. ib. 149, 5 (plebitatem, ignobilitatem, Non.).