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simulate: simulate: see similar
simultaneous: simultaneous: see similar
dissimulate (v.): 1530s, from Latin dissimulatus, past participle of dissimulare "to disguise, hide, conceal, keep secret," from dis- (see dis-) + simulare (see simulate). Related: Dissimulated; dissimulating.
dissimulation (n.): late 14c., from Old French dissimulation (12c.), from Latin dissimulationem (nominative dissimulatio) "a disguising, concealment," noun of action from past participle stem of dissimulare "make unlike, conceal, disguise," from dis- "completely" + simulare "pretend, assume, simulate" (see simulation).
simulacrum (n.): 1590s, from Latin simulacrum "likeness, image, form, representation, portrait," dissimilated from *simulaclom, from simulare "to make like, imitate, copy, represent" (see simulation). The word was borrowed earlier as semulacre (late 14c.), via Old French simulacre.
simular (n.): 1520s, "one who simulates," irregularly formed (perhaps on the model of similar) from Latin simulare "to make like, imitate, copy, represent," from stem of similis "like" (see similar). As an adjective, "simulated," from 1610s.
simulate (v.): 1620s, "feign, pretend, assume falsely" (implied in simulated), back-formation from simulation or else from Latin simulatus, past participle of simulare "to make like, imitate, copy." Meaning "to use a model to imitate certain conditions for purposes of study or training" is from 1947. Related: Simulating.
simulated (adj.): 1620s, "feigned," past participle adjective from simulate (v.). Meaning "imitative for purposes of experiment or training" is from 1966 (agent noun simulator in the related sense dates from 1947; also see simulation). In commercial jargon, "artificial, imitation" by 1942.
simulation (n.): mid-14c., "a false show, false profession," from Old French simulation "pretence" and directly from Latin simulationem (nominative simulatio) "an imitating, feigning, false show, hypocrisy," noun of action from past participle stem of simulare "imitate," from stem of similis "like" (see similar). Meaning "a model or mock-up for purposes of experiment or training" is from 1954.
simulator (n.): 1835, of persons, from Latin simulator "a copier, feigner," agent noun from simulare "imitate," from stem of similis "like" (see similar). In reference to training devices for complex systems, from 1947 (flight simulator).
simulcast (v.): "to broadcast simultaneously on radio and television," 1948, formed from simul(taneous) + (broad)cast. The noun is first recorded 1949, from the verb.
simultaneity (n.): 1650s, from simultaneous + -ity.
simultaneous (adj.): 1650s, from Medieval Latin simultaneus, perhaps from simultim "at the same time," extended from Latin simul "at the same time" (see similar (adj.)), or from simul with ending abstracted from Late Latin spontaneus, where the -t- is organic. Related: Simultaneously.
simurgh (n.): monstrous bird, rational and ancient, in Persian mythology, 1786, from Persian simurgh, from Pahlavi sin "eagle" + murgh "bird." Compare Avestan saeno merego "eagle," Sanskrit syenah "eagle," Armenian cin "kite." Probably identical with the roc (q.v.).
mumpsimus: "A traditional custom or idea adhered to although shown to be unreasonable", Mid 16th century: erroneously for Latin sumpsimus in quod in ore sumpsimus 'which we have taken into the mouth' (from the Eucharist), in allusion to the story of an illiterate priest who, when corrected for reading quod in ore mumpsimus, replied ‘I will not change my old mumpsimus for your new sumpsimus’.
latissimus: "Either of a pair of large, roughly triangular muscles covering the lower part of the back, extending from the sacral, lumbar, and lower thoracic vertebrae to the armpits", Early 17th century: modern Latin, from musculus latissimus dorsi, literally 'broadest muscle of the back'.
simulant: "A thing which simulates or resembles something else", Mid 18th century: from Latin simulant- 'copying, representing', from the verb simulare.