Etymology
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intensity (n.)
1660s, from intense + -ity. Earlier was intenseness (1610s). A scientific term originally; sense of "extreme depth of feeling" attested by 1830.
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change (v.)

c. 1200, "to alter, make different, change" (transitive); early 13c. as "to substitute one for another;" mid-13c. as "to make (something) other than what it was, cause to turn or pass from one state to another;" from late 13c. as "to become different, be altered" (intransitive), from Old French changier "to change, alter; exchange, switch," from Late Latin cambiare "to barter, exchange," extended form of Latin cambire "to exchange, barter," a word of Celtic origin, from PIE root *kemb- "to bend, crook" (with a sense evolution perhaps from "to turn" to "to change," to "to barter"); cognate with Old Irish camm "crooked, curved;" Middle Irish cimb "tribute," cimbid "prisoner;" see cant (n.2).

From c. 1300 as "undergo alteration, become different." In part an abbreviation of exchange. From late 14c. especially "to give an equivalent for in smaller parts of the same kind" (money). Meaning "to take off clothes and put on other ones" is from late 15c. Related: Changed;changing. To change (one's) mind is from 1590s.

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change (n.)

c. 1200, "act or fact of changing," from Anglo-French chaunge, Old French change "exchange, recompense, reciprocation," from changier "to alter; exchange; to switch" (see change (v.)). Related: changes.

Meaning "a different situation, variety, novelty" is from 1680s (as in for a change, 1690s). Meaning "something substituted for something else" is from 1590s. Meaning "place where merchants meet to do business" is from c. 1400. Meaning "the passing from life to death" is biblical (161os).

The financial sense of "balance of money returned after deducting the price of a purchase from the sum paid" is first recorded 1620s; hence to make change (by 1865). Bell-ringing sense is from 1610s, "any sequence other than the diatonic." Hence the figurative phrase ring changes "repeat in every possible order" (1610s). Figurative phrase change of heart is from 1828. In reference to women, change of life "final cessation of menstruation" is recorded from 1834.

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short-change (v.)
also shortchange, "to cheat by giving too little change to," 1903, from adjectival expression short-change (with man, trick, etc.), 1901, from short (adj.) + change (n.).
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climate change (n.)

1983, in the modern "human-caused global warming" sense. See climate (n.) + change (n.). Climatic change in a similar sense was in use from 1975.

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change-over (n.)

"alteration from one system to another," 1907, from the verbal phrase; see change (v.) + over (adv.).

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plus ca change 

phrase expressing the fundamental immutability of life, human situations, etc., 1903, French, plus ça change, plus c'est la même chose (1849), literally "the more it changes, the more it stays the same."

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candela (n.)
unit of luminous intensity, 1950, from Latin candela "a light, torch, candle made of tallow or wax" (see candle).
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ardency (n.)
1540s, "warmth of feeling, desire," from ardent + -cy. A figurative sense, the literal meaning "intensity of heat" is attested from 1630s.
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subdued (adj.)
c. 1600, "subjugated," past-participle adjective from subdue. Meaning "calmed down, reduced in intensity" is recorded from 1822.
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