Etymology
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Words related to fort

*bhergh- (2)
Proto-Indo-European root meaning "high," with derivatives referring to hills and hill-forts.

It forms all or part of: barrow (n.2) "mound, hill, grave-mound;" belfry; borough; bourgeoisie; burg; burgess; burgher; burglar; faubourg; iceberg.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit b'rhant "high," brmhati "strengthens, elevates;" Avestan brzant- "high," Old Persian bard- "be high;" Greek Pergamos, name of the citadel of Troy; Old Church Slavonic bregu "mountain, height;" Old Irish brigh "mountain;" Welsh bera "stack, pyramid."
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aqua fortis (n.)
also aquafortis, old commercial name for "diluted nitric acid," c. 1600, Latin, literally "strong water;" see aqua- + fort. So called for its power of dissolving metals (copper, silver) which are unaffected by other agents.
comfort (v.)

late 13c., conforten "to cheer up, console, soothe when in grief or trouble," from Old French conforter "to comfort, to solace; to help, strengthen," from Late Latin confortare "to strengthen much" (used in Vulgate), from assimilated form of Latin com-, here perhaps an intensive prefix (see com-), + fortis "strong" (see fort).

The change of -n- to -m- began in English 14c. In Middle English also "give or add strength to" (c. 1300); "encourage, urge, exhort" (c. 1300). Related: Comforted; comforting.

effort (n.)

late 15c., "laborious attempt, strenuous exertion," from French effort, from Old French esforz "force, impetuosity, strength, power," verbal noun from esforcier "force out, exert oneself," from Vulgar Latin *exfortiare "to show strength" (source of Italian sforza), from Latin ex "out" (see ex-) + Latin fortis "strong" (see fort).

Effort is only effort when it begins to hurt. [José Ortega y Gasset, writing of Goethe in Partisan Review, vol. xvi, part ii, 1949]

Related: Efforts "voluntary exertion," also "result of exertion."

force (n.)
c. 1300, "physical strength," from Old French force "force, strength; courage, fortitude; violence, power, compulsion" (12c.), from Vulgar Latin *fortia (source also of Old Spanish forzo, Spanish fuerza, Italian forza), noun use of neuter plural of Latin fortis "strong, mighty; firm, steadfast; brave, bold" (see fort).

Meanings "power to convince the mind" and "power exerted against will or consent" are from mid-14c. Meaning "body of armed men, a military organization" first recorded late 14c. (also in Old French). Physics sense is from 1660s; force field attested by 1920. Related: Forces.
forte (adj.)
music instruction, "loud, loudly," from Italian forte, literally "strong," from Latin fortis "strong" (see fort). Opposed to piano.
forte (n.)

1640s, fort, from French fort "strong point (of a sword blade)," earlier "fort, fortress" (see fort). Meaning "strong point of a person, that in which one excels," is from 1680s. Final -e- added 18c. in imitation of Italian forte "strong."

fortify (v.)
early 15c., "increase efficacy" (of medicine); mid-15c., "provide (a town) with walls and defenses," from Old French fortifiier (14c.) "to fortify, strengthen," from Late Latin fortificare "to strengthen, make strong," from Latin fortis "strong" (see fort) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Sense of "to strengthen mentally or morally" is from late 15c. Meaning "add liquor or alcohol" is from 1880; meaning "add nutrients to food" is from 1939. Related: Fortified; fortifying.
fortissimo (adj.)
1724, from Italian fortissimo, superlative of forte "loud, strong," from Latin fortis "strong" (see fort).
fortitude (n.)

late 14c., "moral strength (as a cardinal virtue); courage," from Latin fortitudo "strength, force, firmness, manliness," from fortis "strong, brave" (see fort). From early 15c. as "physical strength."