c. 1500, "neatly or smartly dressed," probably ultimately from trim (v.) or from related Old English trum "firm, fixed, secure, strong, sound, vigorous, active." Related: Trimly; trimness.

c. 1300, "to beat with a heavy implement, make the ground firm by tamping," from ram (n.). By 1864 as "dash violently against, strike with great force." Related: Rammed; ramming.

by 1670s as an abbreviation of company in the business sense, indicating the partners in the firm whose names do not appear in its name. Hence and co. to indicate "the rest" of any group (1757).

1520s, "to be, exist in a permanent state as a body composed of parts," from French consister (14c.) or directly from Latin consistere "to stand firm, take a standing position, stop, halt," from assimilated form of com "with, together" (see con-) + sistere "to place," causative of stare "to stand, be standing" (from PIE root *sta- "to stand, make or be firm").

From 1560s, with of, as "be composed, be made up." From 1630s as "be consistent." Related: Consisted; consisting.

late 14c., "appointment to meet at a certain time and place," from Old French tristre "waiting place, appointed station in hunting," probably from a Scandinavian source such as Old Norse treysta "to trust, make firm," from Proto-Germanic *treuwaz "having or characterized by good faith," from PIE *drew-o-, a suffixed form of the root *deru- "be firm, solid, steadfast." The notion would be "place one waits trustingly." As a verb, late 14c. Related: Trysting.

mid-12c., "trustworthy, reliable;" mid-13c., "constant, steadfast; virtuous;" from Old French stable, estable "constant, steadfast, unchanging," from Latin stabilis "firm, steadfast, stable, fixed," figuratively "durable, unwavering," literally "able to stand," from PIE *stedhli-, suffixed form of root *sta- "to stand, make or be firm." From c. 1300 as "well-founded, well-established, secure" (of governments, etc.). Physical sense of "secure against falling" is recorded from late 14c.; also "of even temperament." Of nuclear isotopes, from 1904.

"not firm in purpose, wavering, given to doubt or hesitation," 1570s, from Latin irresolutus "not loosed, not loosened," from assimilated form of in- "not, opposite of" (see in- (1)) + resolutus (see resolute). Related: Irresolutely.

late 13c., "a base, foundation;" late 14c., "position of the feet on the ground, stance," a gerundive formation from foot (n.). Figurative meaning "firm or secure position" is from 1580s; that of "condition on which anything is established" is from 1650s.

"a place not easily forced, a stronghold," late Old English fæstnes "firmness, strongness, massiveness, stability; the firmament," from fast (adj.) in its older sense of "firm, fixed in place" + -ness.

"the checking of a discharge," medical Latin, from Greek epistasis "a stopping, stoppage, a halting," from epi "upon" (see epi-) + stasis "a stopping or standing," from PIE root *sta- "to stand, make or be firm."