Etymology
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consistency (n.)

1590s, "firmness of matter," from Medieval Latin consistentia   literally "a standing together," or directly from Latin consistentem (nominative consistens), present participle of consistere "to stand firm, take a standing position, stop, halt," from assimilated form of com "with, together" (see con-) + sistere "to place," causative of stare "to stand, be standing," from PIE root *sta- "to stand, make or be firm."

Meaning "state of being in agreement or harmony" (with something) is from 1650s; meaning "steady adherence to principles, patterns of action, etc." is from 1716. Meaning "harmonious connection, as of the parts of a system" is from 1787.

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inconsistency (n.)
1640s, "something which is inconsistent;" 1650s as "quality of being inconsistent," from in- (1) "not, opposite of" + consistency. Related: Inconsistencies. Inconsistence (1630s) is marked "Now rare or Obs." in OED.
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consistent (adj.)

1570s, "consisting" (a sense now obsolete), from Latin consistentem (nominative consistens), present participle of consistere "to stand firm, take a standing position, stop, halt," from assimilated form of com "with, together" (see con-) + sistere "to place," causative of stare "to stand, be standing," from PIE root *sta- "to stand, make or be firm."

Sense of "standing together in agreement, agreeing" (with with) is first attested 1640s; meaning "marked by consistency" is from 1732. The literal, physical sense survives in consistency. Related: Consistently.

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papery (adj.)

"like paper, having the thinness and consistency of paper," 1620s, from paper (n.) + -y (2).

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runny (adj.)

"having a fluid consistency, tending to run," 1817, from run (v.) + -y (2).

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milky (adj.)
late 14c., "milk-like in color or consistency," from milk (n.) + -y (2). Related: Milkily; milkiness.
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powdery (adj.)

"of the nature or consistency of powder," early 15c., poudri, from powder (n.) + -y (2).

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homogenize (v.)
"make similar," 1742, from homogenous + -ize. Sense of "render milk uniform in consistency" is from 1901. Related: Homogenized; homogenizing; homogenizer.
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jellied (adj.)
1590s, "of the consistency of jelly;" 1895, sweetened with jelly; past-participle adjective from jelly (v.).
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oozy (adj.)

Old English wosig "juicy, moist;" see ooze (v.) + -y (2). Original sense now obsolete; meaning "containing or resembling fine soft mud; having the consistency of wet mud or slime" is from 1560s. Related: Ooziness.

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