early 15c., "effective as a cause or agent," from Old French causatif, from Latin causativus, from causa "a cause, reason" (see cause (n.)). Meaning "expressing causation" is from c. 1600; hence the noun, in grammar, "a form of a noun or verb expressing causation" (1824).
Late Latin Priscianus, name of the celebrated Roman grammarian (c. 500-530); commonly in the phrase break Priscian's head (1520s) "violate rules of grammar" (Latin diminuere Prisciani caput). For the name, see Priscilla.
1837, "exhibiting or pertaining to prosthesis in grammar;" 1902 in the surgical sense; from Latinized form of Greek prosthetikos "disposed to add," from prosthetos "added or fitted to," verbal adjective of prostithenai "to put to, add to" (see prosthesis). Related: Prosthetically.
in grammar, "the arrangement of repeated, parallel, or contrasted words or phrases in pairs with inversion of word order," 1850, Latinized from Greek khiasmos "a placing crosswise, diagonal arrangement" (see chi).
Adam, first of men,
To first of women, Eve.
c. 1600, in grammar, "the form or number relating to two," from Latin dualis "that contains two; the dual number, duality," from duo "two" (from PIE root *dwo- "two"). General sense of "relating to two, expressing two, composed or consisting of two parts" is from 1650s. Related: Dually.
1520s, in grammar, "expressing command," used of the form of a verb which expresses command, entreaty, advice, or exhortation, from Late Latin imperativus "pertaining to a command," from imperat-, past participle stem of imperare "to command, requisition," from assimilated form of in- "into, in" (from PIE root *en "in") + parare "to arrange, prepare, adorn" (from PIE root *pere- (1) "to produce, procure").