Etymology
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cade (n.)
"a pet or tame animal," especially a lamb, late 15c., often used in reference to young animals abandoned by their mothers and brought up by hand; of unknown origin. Meaning "spoiled or over-indulged child" is from 1877. Also as a verb, "to rear by hand or tenderly," and an adjective (late 15c.).
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pet (n.1)

"domesticated or tamed animal kept as a favorite," 1530s, originally in Scottish and northern England dialect (and exclusively so until mid-18c.), a word of unknown origin. Sense of "indulged or favorite child" (c. 1500) is recorded slightly earlier than that of "animal kept as a favorite" (1530s), but the latter may be the primary meaning. Probably associated with or influenced by petty.

Know nature's children all divide her care;
The fur that warms a monarch warm'd a bear.
While man exclaims, 'See all things for my use!'
'See man for mine!' replies a pamper'd goose:
[Alexander Pope, "Essay on Man"]
It is an amiable part of human nature, that we should love our animals; it is even better to love them to the point of folly, than not to love them at all. [Stevie Smith, "Cats in Colour," 1959]

In early use typically a lamb brought up by hand (compare cade); but the earliest surviving reference lists "Parroquets, monkeys, peacocks, swans, &c., &c." As a term of endearment by 1849. Teacher's pet as a derogatory term for a teacher's favorite pupil is attested from 1890. Pet-shop "shop selling animals to be kept as pets" is from 1928. 

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cavalcade (n.)

"a procession, a train of persons on horseback or in carriages," 1640s, via French cavalcade (15c.), from Italian cavalcata, from cavalcare "to ride on horseback," from Vulgar Latin *caballicare (also source of Spanish cabalgada, Portuguese cavalgata), from Latin caballus (see cavalier (n.)).

Literally, "a procession on horseback;" general sense of "a procession" of any sort is from 1660s; in 20c. -cade came to be regarded as a suffix and rode off on its own to form motorcade (1909), etc. The word's earliest use in English was in the now-obsolete sense "a horseback ride" (1590s).

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cadence (v.)
"to regulate by musical measure," 1749, from cadence (n.). Related: Cadenced; cadencing.
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cadence (n.)

late 14c., "flow of rhythm in prose or verse," from French cadence, from Old Italian cadenza "conclusion of a movement in music," literally "a falling," from Vulgar Latin *cadentia, from neuter plural of Latin cadens, present participle of cadere "to fall" (from PIE root *kad- "to fall"). A doublet of chance (n.).

The notion is of a "fall" in the voice in reading aloud or speaking, as at the end of a sentence, also the rising and falling in modulation of tones in reciting. Later (1590s) extended to music, in reference to a sequence of chords expressing conclusion at the end of a phrase and resolving to the key in which the piece was written. Also the measure or beat of any rhythmic movement (c. 1600). In 16c., sometimes used literally for "an act of falling." Related: Cadential.

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cadet (n.)

c. 1610, "younger son or brother;" 1650s, "gentleman entering the military as a profession;" from French cadet "military student officer," noun use of adjective, "younger" (15c.), from Gascon capdet "captain, chief, youth of a noble family," from Medieval Latin capitellum, "little chief," literally "little head" (hence, "inferior head of a family"), diminutive of Latin caput "head" (from PIE root *kaput- "head").

"The eldest son being regarded as the first head of the family, the second son the cadet, or little head" [Kitchin]. Younger sons from noble families were sent to French court to serve as officers, without rising through the ranks or attending military school, after being attached to a corps without pay and enjoying certain privileges. This gave the word its military meaning "accepted candidate for a commission who is undergoing training to become an officer." Meaning "student at a military college" is from 1775.

Via the Scottish form cadee comes caddie "a messenger boy," especially one who carries clubs for a golfer, and slang cad.

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cadenza (n.)
"ornamental passage near the close of a song or solo," 1780, from Italian cadenza "conclusion of a movement in music" (see cadence (n.)).
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