1670s, as the fidget "uneasiness," later the fidgets, from a verb fidge "move restlessly" (16c., surviving longest in Scottish), perhaps from Middle English fiken "to fidget, hasten" (see fike (v.)).
"to loosen and throw about in disorder, cause to have a disordered or neglected appearance," 1590s, said originally of the hair, later of the dress. It is chiefly a back-formation from disheveled (q.v.).
1947, RAF slang for "navigational instruments;" later extended to any sort of apparatus that operates in a sealed container. Especially of flight recorders from c. 1964.
assimilated form of ad- "to, toward, before" before stems beginning in -t-; see ad-. In Old French and Middle English regularly reduced to a-, later restored.
1899; never defined in a generally accepted way. Early use with reference to British India; later often of everything between Egypt and Iran. Hence Middle-Eastern (1903).