Etymology
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decree (v.)

"to order or promulgate with authority," late 14c., decreen, from decree (n.). Related: Decreed; decreeing.

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decree (n.)

"special ordinance or regulation promulgated by authority," early 14c., originally ecclesiastical, secular use is by late 14c., from Old French decre, variant of decret (12c., Modern French décret), from Latin decretum, neuter of decretus, past participle of decernere "to decree, decide, pronounce a decision," from de (see de-) + cernere "to separate" (from PIE root *krei- "to sieve," thus "discriminate, distinguish").

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decretory (adj.)

"pertaining to or following a decree," 1630s, from Latin decretorius, from decretum (see decree (n.)). Related: Decretorial (1580s).

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*krei- 
Proto-Indo-European root meaning "to sieve," thus "discriminate, distinguish."

It forms all or part of: ascertain; certain; concern; concert; crime; criminal; crisis; critic; criterion; decree; diacritic; discern; disconcert; discreet; discriminate; endocrine; excrement; excrete; garble; hypocrisy; incertitude; recrement; recriminate; riddle (n.2) "coarse sieve;" secret; secretary.

It is the hypothetical source of/evidence for its existence is provided by: Greek krinein "to separate, decide, judge," krinesthai "to explain;" Latin cribrum "sieve," crimen "judgment, crime," cernere "to sift, distinguish, separate;" Old Irish criathar, Old Welsh cruitr "sieve;" Middle Irish crich "border, boundary;" Old English hriddel "sieve."
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predestine (v.)

late 14c., predestinen, "to foreordain, decree beforehand," from Old French prédestiner (12c.) "predestine, ordain" (of God) and directly from Latin praedestinare "determine beforehand" (see predestination). Related: Predestined; predestining.

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ukase (n.)
"decree issued by a Russian emperor," 1729, from Russian ukaz "edict," back-formation from ukazat' "to show, decree, to order," from Old Church Slavonic ukazati, from u- "away," perhaps here an intensive prefix, from PIE *au- (2) "off, away" + kazati "to show, order," from Slavic *kaz- (related to the first element of Casimir), from PIE root *kwek- "to appear, show."
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predetermine (v.)

"to determine beforehand, destine by previous decree," 1620s, originally theological, from pre- "before" + determine or else from Late Latin praedeterminare (Augustine). Related: Predetermined; predetermining; predeterminate.

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are (n.)
metric unit of square measure, 10 meters on each side (100 square meters), 1819, from French, formed 1795 by decree of the French National Convention, from Latin area "vacant piece of ground" (see area).
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enact (v.)
early 15c., "act the part of, represent in performance," from en- (1) "make, put in" + act (v.). Meaning "decree, establish, sanction into law" is from mid-15c. Related: Enacted; enacting.
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Ronald 
masc. proper name, from Old Norse Rögnvaldr "Having the Gods' Power," from rögn "gods," literally "decreeing powers" (plural of regin "decree") + valdr "ruler" (from Proto-Germanic *waldan, from PIE root *wal- "to be strong").
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