Etymology
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steadfast (adj.)

Old English stedefæst "secure in position, steady, firm in its place," from stede (see stead) + fæst (see fast (adj.)); similar formation in Middle Low German stedevast, Old Norse staðfastr "steadfast, firm; faithful, staunch, firm in one's mind." Of persons, in English, "unshakable, stubborn, resolute" from c. 1200. Related: Steadfastly, steadfastness.

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consolidate (v.)

1510s, "to combine into one body," from Latin consolidatus, past participle of consolidare "to make solid," from assimilated form of com "with, together" (see con-) + solidare "to make solid," from solidus "firm, whole, undivided, entire," from suffixed form of PIE root *sol- "whole."

Meaning "to make firm or strong" is from 1530s; that of "to form into a solid mass" is from 1650s. Intransitive sense "to grow firm or compact" is from 1620s. Caxton (late 15c.) has consolid (v.), from French consolider. Related: Consolidated; consolidating.

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consolidation (n.)

c. 1400, consolidacioun, "act of making or process of becoming solid or firm," of wounds, broken bones, etc., from Late Latin consolidationem (nominative consolidatio), noun of action from past participle stem of consolidare "to make firm, consolidate," from assimilated form of com "with, together" (see con-) + solidare "to make solid," from solidus "firm, whole, undivided, entire," from suffixed form of PIE root *sol- "whole." Meaning "act of bringing together and uniting different parts into one body or whole" is from 1670s.

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staunch (adj.)

early 15c., "impervious to water," from Old French estanche "firm, watertight," fem. of estanc "tired, exhausted, wearied, vanquished; water-tight; withered, dried" (Modern French étanche), from Vulgar Latin *stanticare (source also of Spanish estanco "water-tight," Italian stanco "exhausted, weary"), probably from Latin stans (genitive stantis), present participle of stare "to stand," from PIE root *sta- "to stand, make or be firm." Sense of "strong, substantial" first recorded mid-15c.; of persons, "standing firm and true to one's principles" from 1620s.

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trig (adj.)

"smart, trim," c. 1200, from Old Norse tryggr "firm, trusty, true," 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." A Scottish and northern word only until 19c. Related: Trigness.

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unshaken (adj.)

mid-15c., "not agitated," from un- (1) "not" + shaken. Meaning "not moved from a firm position" is recorded from 1540s.

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Constantine 

masc. proper name, Latin Constantinus, from constans "standing firm, stable, steadfast, faithful," present participle of constare "to stand together," from assimilated form of com "with, together" (see con-) + stare "to stand," from PIE root *sta- "to stand, make or be firm." With the common name-forming suffix -inus (see -ine (1)).

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constant (adj.)
Origin and meaning of constant

late 14c., "steadfast, resolute; patient, unshakable; fixed or firm in mind," from Old French constant (14c.) or directly from Latin constantem (nominative constans) "standing firm, stable, steadfast, faithful," present participle of constare"to stand together," from assimilated form of com "with, together" (see con-) + stare "to stand," from PIE root *sta- "to stand, make or be firm."

Meaning "steadfast in attachment to a person or cause" is from early 15c. Of actions and conditions, "fixed, not varying" (1540s); "continual, enduring" (1650s). Meaning "regularly recurring" is from 1817. Related: Constantly.

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resolved (adj.)

of persons, "determined, resolute, firm," 1510s, past-participle adjective from resolve (v.). Related: Resolvedly.

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subsistent (adj.)

1520s, from Latin subsistentem (nominative subsistens), present participle of subsistere "stand still or firm" (see subsistence).

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