Etymology
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valiance (n.)
"valiant character" (obsolete or archaic), mid-15c., earlier vailance (late 14c.), from Anglo-French vaillaunce, valiauns (c. 1300) or Old French vaillance "value, price; merit, worth; virtue, fine qualities; courage, valor" (12c.), from Old French valiant "stalwart, brave," present-participle adjective from valoir "be worthy," originally "be strong," from Latin valere "be strong, be well, be worth, have power, be able, be in health" (from PIE root *wal- "to be strong").
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Walter 
masc. proper name, from Old North French Waltier (Old French Gualtier, Modern French Gautier), of Germanic origin and cognate with Old High German Walthari, Walthere, literally "ruler of the army," from waltan "to rule" (from Proto-Germanic *waldan, from PIE root *wal- "to be strong") + hari "host, army" (see harry). Walter Mitty (1939) is from title character in "The Secret Life of Walter Mitty" by U.S. short story writer James Thurber (1894-1961).
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convalesce (v.)

"to grow better after sickness, make progress toward the recovery of health," late 15c., from Latin convalescere "thrive, regain health, begin to grow strong or well," from assimilated form of com-, here perhaps an intensive prefix (see com-), + valescere "to begin to grow strong," inchoative of valere "to be strong" (from PIE root *wal- "to be strong"). Only in Caxton and Scottish writers until 19c. Related: Convalesced; convalescing.

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ambivalence (n.)

"simultaneous conflicting feelings," 1924 (1912 as ambivalency), from German Ambivalenz, coined 1910 by Swiss psychologist Eugen Bleuler on model of German Equivalenz "equivalence," etc., from Latin ambi- "both, on both sides" (see ambi-) + valentia "strength," abstract noun from present participle of valere "be strong" (from PIE root *wal- "to be strong"). A psychological term that by 1929 had taken on a broader literary and general sense.

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avail (v.)
c. 1300, availen, "to help (someone), assist; benefit, be profitable to; be for the advantage of; have force or efficacy, serve for a purpose," apparently an Anglo-French compound of Old French a- "to" (see ad-) + vaill-, present stem of valoir "be worth," from Latin valere "be strong, be worth" (from PIE root *wal- "to be strong"). Related: Availed; availing. As a noun, from c. 1400.
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convalescent (adj.)

"recovering strength and health after sickness," 1650s, from French convalescent, from Latin convalescentem (nominative convalescens), present participle of convalescere "thrive, regain health, begin to grow strong or well," from assimilated form of com-, here perhaps an intensive prefix (see com-), + valescere "to begin to grow strong," inchoative of valere "to be strong" (from PIE root *wal- "to be strong").

As a noun, "one who is recovering strength and health after sickness or debility," attested from 1758.

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valor (n.)
c. 1300, "value, worth," from Old French valor, valour "valor, moral worth, merit, courage, virtue" (12c.), from Late Latin valorem (nominative valor) "value, worth" (in Medieval Latin "strength, valor"), from stem of Latin valere "be strong, be worth" (from PIE root *wal- "to be strong"). The meaning "courage" is first recorded 1580s, from Italian valore, from the same Late Latin word. (The Middle English word also had a sense of "worth or worthiness in respect of manly qualities").
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value (n.)
Origin and meaning of value
c. 1300, "price equal to the intrinsic worth of a thing;" late 14c., "degree to which something is useful or estimable," from Old French value "worth, price, moral worth; standing, reputation" (13c.), noun use of fem. past participle of valoir "be worth," from Latin valere "be strong, be well; be of value, be worth" (from PIE root *wal- "to be strong"). The meaning "social principle" is attested from 1918, supposedly borrowed from the language of painting. Value judgment (1889) is a loan-translation of German Werturteil.
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convalescence (n.)

"a gradual recovery of strength and health after a sickness," late 15c., from French convalescence (15c.), from Late Latin convalescentia "a regaining of health," from convalescentem (nominative convalescens), present participle of Latin convalescere"thrive, regain health, begin to grow strong or well," from assimilated form of com-, here perhaps an intensive prefix (see com-), + valescere "to begin to grow strong," inchoative of valere "to be strong" (from PIE root *wal- "to be strong"). Related: Convalescency.

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Donald 

surname, from 13c. Scottish Dofnald, Dufenald, probably from Gaelic Domhnall, Old Irish Domnall (pronounced "Dovnall"), from Proto-Celtic *Dubno-valos "world-mighty, ruler of the world," from *walos "ruler" (from PIE root *wal- "to be strong") + Old Irish domun "world," from PIE root *dheub- "deep, hollow," via sense development from "bottom" to "foundation" to "earth" to "world" (see deep (adj.)). A top 10 name for boys born in the U.S. between 1923 and 1943. Disney's Donald Duck cartoon character debuted in 1934.

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