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ostensible [ostensible 词源字典]: ostensible: [18] Ostensible means literally ‘that can be shown’. It comes via French from medieval Latin ostensibilis, a derivative of the Latin verb ostendere ‘show’ (itself a compound formed from the prefix ob- ‘in front of’ and tendere ‘stretch’, source of English extend, tend, tense etc). Its original meaning ‘showable’ survived into English (‘You should send me two letters – one confidential, another ostensible’, Jeremy Bentham, 1828), but seems to have died out by the mid-19th century.

Two metaphorical strands came with it, though. One, ‘vainly conspicuous’, goes right back to ostendere, and is still preserved in English ostentation [15], although it has disappeared as far as ostensible is concerned. The other, ‘presented as real but not so’, is today the central meaning of the adjective.
=> extend, ostentation, tend, tense[ostensible etymology, ostensible origin, 英语词源]
tense: tense: English has two separate words tense. The older, ‘verb form indicating time’ [14], came via Old French tens from Latin tempus ‘time’ (source also of English temporal, temporary, etc). The original meaning ‘time’ survived into English, but died out in the early 16th century. The adjective tense [17] was adapted from tensus, the past participle of Latin tendere ‘stretch’ (source also of English tend, tendency, etc). It originally meant simply ‘stretched tight’, and the metaphorical ‘strained’ did not emerge until the 19th century. Tension [16] comes from the Latin derivative tensiō.
=> temporary; tend
utensil: utensil: [14] Latin ūtēnsilis meant ‘usable, useful’. It was derived from the verb ūtī ‘use’ (source also of English use, utility, utilize, etc). In the Middle Ages it was adapted into a noun, ūtēnsilia, meaning ‘things for use, implements’. This passed into English via Old French utensile as utensil, still a collective noun, but by the 15th century it was being used for an individual ‘implement’.
=> use
coextensive (adj.): 1771, from co- + extensive.
Doctor Martens: type of heavy walking boots, 1977 (use claimed from 1965), trademark name taken out by Herbert Funck and Klaus Martens of West Germany.
extensible (n.): 1610s, from French extensible, from stem of Latin extendere (see extend). Earlier was extendible (late 15c.).
extension (n.): c. 1400, "swelling, bulging," from Latin extensionem/extentionem (nominative extensio/extentio) "a stretching out, extension," noun of action from past participle stem of extendere (see extend). In a concrete sense, "extended portion of something" (a railroad, etc.), from 1852. Telephone sense is from 1906.
extensive (adj.): "vast, far-reaching;" c. 1600 of immaterial, c. 1700 of material things; from Late Latin extensivus, from extens-, past participle stem of Latin extendere "to stretch out, spread" (see extend). Earlier in a medical sense, "characterized by swelling" (early 15c.). Related: Extensively; extensiveness.
extensor (n.): "muscle which serves to straighten or extend any part of the body," 1713, short for medical Latin musculus extensor, from Late Latin extensor "stretcher," agent noun from Latin extendere "spread out, spread" (see extend).
Hortense: fem. proper name, from Latin Hortensia, fem. of Hortensius, a Roman gens name, related to hortus "garden" (see yard (n.1)).
hypertension (n.): 1863, from hyper- + tension. Originally in medical use; of emotions or nerves, from 1936.
intense (adj.): c. 1400, from Middle French intense (13c.), from Latin intensus "stretched, strained, tight," originally past participle of intendere "to stretch out, strain" (see intend); thus, literally, "high-strung." Related: Intensely.
intensification (n.): 1847, noun of action from intensify.
intensify (v.): 1817, from intense + -ify, first attested in Coleridge, in place of intend, which he said no longer was felt as connected with intense. Middle English used intensen (v.) "to increase (something), strengthen, intensify," early 15c. Related: Intensified; intensifying.
intension (n.): c. 1600, from Latin intensionem (nominative intensio) "a stretching, straining, effort," noun of action from past participle stem of intendere (see intend).
intensity (n.): formed in English 1660s from intense + -ity. Earlier was intenseness (1610s). Sense of "extreme depth of feeling" first recorded 1830.
intensive (adj.): mid-15c., from French intensif (14c.), from Latin intens-, past participle stem of intendere (see intend). As a noun, 1813, from the adjective. Alternative intensitive is a malformation. Intensive care attested from 1958. Related: Intensively.
ostensible (adj.): 1762, "capable of being shown, presentable," from French ostensible, from Latin ostens-, past participle stem of ostendere "to show, expose to view; to stretch out, spread before; exhibit, display," from ob "in front of" (see ob-) + tendere "to stretch" (see tenet). Meaning "apparent, professed" is from 1771.
ostensibly (adv.): 1765, from ostensible + -ly (2).
ostensive (adj.): c. 1600, from Late Latin ostensivus "showing," from Latin ostensus, past participle of ostendere "to show" (see ostensible).
pretense (n.): also pretence, early 15c., "the putting forth of a claim," from Anglo-French pretensse, Middle French pretensse (Modern French prétense), from Medieval Latin noun use of fem. of Late Latin praetensus, altered from Latin praetentus, past participle of praetendere (see pretend). Meaning "false or hypocritical profession" is from 1540s.
pretension (n.): mid-15c., "assertion, allegation; objection; intention; signification," from Medieval Latin pretensionem (nominative praetensio), noun of action from past participle stem of Latin praetendere "stretch in front, put forward, allege" (see pretend (v.)). Meaning "unproven claim" is from c. 1600. Sense of "ostentation" is from 1727.
tense (adj.): "stretched tight," 1660s, from Latin tensus, past participle of tendere "to stretch, extend" (see tenet). Figurative sense of "in a state of nervous tension" is first recorded 1821. Related: Tensely; tenseness.
tense (n.): "form of a verb showing time of an action or state," early 14c., tens "time," also "tense of a verb" (late 14c.), from Old French tens "time, period of time, era; occasion, opportunity; weather" (11c., Modern French temps), from Latin tempus "a portion of time" (also source of Spanish tiempo, Italian tempo; see temporal).
tense (v.): "to make tense," 1670s, from tense (adj.); intransitive sense of "to become tense" (often tense up) is recorded from 1946. Related: Tensed; tensing.
tensile (adj.): 1620s, "stretchable," from Modern Latin tensilis "capable of being stretched," from Latin tensus, past participle of tendere "to stretch" (see tenet). Meaning "pertaining to tension" is from 1841.
tension (n.): 1530s, "a stretched condition," from Middle French tension (16c.) or directly from Latin tensionem (nominative tensio) "a stretching" (in Medieval Latin "a struggle, contest"), noun of state from tensus, past participle of tendere "to stretch," from PIE root *ten- "stretch" (see tenet). The sense of "nervous strain" is first recorded 1763. The meaning "stress along lines of electromotive force" (as in high-tension wires) is recorded from 1785.
tensor (n.): muscle that stretches or tightens a part, 1704, Modern Latin agent noun from tens-, past participle stem of Latin tendere "to stretch" (see tenet).
utensil (n.): late 14c., from Old French utensile "implement" (14c., Modern French ustensile), from Latin utensilia "materials, things for use," noun use of neuter plural of utensilis (adj.) "fit for use, of use, useful," from uti (see use (v.)).
martensite: "A hard and very brittle solid solution of carbon in iron that is the main constituent of hardened steel", Late 19th century: named after Adolf Martens (1850–1914), German metallurgist, + -ite¹.
extensile: "Capable of being stretched out or protruded", Mid 18th century: from Latin extens- 'stretched out' (from the verb extendere) + -ile.
protensive: "Chiefly Philosophy . Extending in time; having duration; continuing, lasting, enduring", Late 17th cent.; earliest use found in John Flavell (?1630–1691), Presbyterian minister and religious writer. From classical Latin prōtēns-, past participial stem of prōtendere protend + -ive.
angiotensin: "A protein whose presence in the blood promotes aldosterone secretion and tends to raise blood pressure", 1950s: from angio- + (hyper)tens(ion) + -in¹.