Etymology
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Words related to case

*kap- 

Proto-Indo-European root meaning "to grasp."

It forms all or part of: accept; anticipate; anticipation; behave; behoof; behoove; cable; cacciatore; caitiff; capable; capacious; capacity; capias; capiche; capstan; caption; captious; captivate; captive; captor; capture; case (n.2) "receptacle;" catch; catchpoll; cater; chase (n.1) "a hunt;" chase (v.) "to run after, hunt;" chasse; chasseur; conceive; cop (v.) "to seize, catch;" copper (n.2) "policeman;" deceive; emancipate; except; forceps; gaffe; haft; have; hawk (n.); heave; heavy; heft; incapacity; inception; incipient; intercept; intussusception; manciple; municipal; occupy; participation; perceive; precept; prince; purchase; receive; recipe; recover; recuperate; sashay; susceptible.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kapati "two handfuls;" Greek kaptein "to swallow, gulp down," kope "oar, handle;" Latin capax "able to hold much, broad," capistrum "halter," capere "to grasp, lay hold; be large enough for; comprehend;" Lettish kampiu "seize;" Old Irish cacht "servant-girl," literally "captive;" Welsh caeth "captive, slave;" Gothic haban "have, hold;" Old English hæft "handle," habban "to have, hold."

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casing (n.)
1570s, "action of fitting with a case," verbal noun from case (v.). Meaning "a covering, an enclosure" is from 1839.
*kad- 
Proto-Indo-European root meaning "to fall."

It forms all or part of: accident; cadaver; cadence; caducous; cascade; case (n.1); casual; casualty; casuist; casus belli; chance; cheat; chute (n.1); coincide; decadence; decay; deciduous; escheat; incident; occasion; occident; recidivist.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sad- "to fall down;" Latin casus "a chance, occasion, opportunity; accident, mishap," literally "a falling," cadere "to fall, sink, settle down, decline, perish;" Armenian chacnum "to fall, become low;" perhaps also Middle Irish casar "hail, lightning."
befall (v.)
Old English befeallan "to deprive of; fall to, occur to, be assigned to," from be- "by, about" + feallan (see fall). Compare Old Frisian bifalla, Old Saxon, Old High German bifallan, German befallen. Intransitive sense of "to happen, come to pass" is from c. 1300. Related: Befell; befalling.
basket case (n.)
1919, American English, originally a reference to rumors of quadriplegics as a result of catastrophic wounds suffered in World War I (the U.S. military authorities vehemently denied there were any such in its hospitals), from basket (n.) + case (n.2). Probably literal, i.e., stuck in a basket, but basket had colloquial connotations of poverty (begging) and helplessness long before this. Figurative sense of "person emotionally unable to cope" is from 1921.
bookcase (n.)
also book-case, "case with shelves for holding books," 1726, from book (n.) + case (n.2). An Old English word for this was bocfodder.
briefcase (n.)
also brief-case, "portable folding case for holding papers," 1908, from brief (n.) in the paper sense + case (n.2). Earlier was brief-bag (1806).
caisson (n.)

"ammunition wagon; wooden chest for bombs, gunpowder, etc.," 1704, from French caisson "ammunition wagon," originally "large box" (16c.), from Italian cassone, augmentative form of cassa "a chest," from Latin capsa "a box" (see case (n.2)).

capsicum (n.)

genus of pepper plants, of unknown origin, perhaps irregularly formed from Latin capsa "box" (see case (n.2)) based on the shape of the fruit. Adopted as a genus name through the writings of French botanist Joseph Pitton de Tournefort (1656-1708), but he did not explain the word. 

capsid (adj.)
1889 in biology, "pertaining to capsidae," a type of insect, from Latin capsa "box" (see case (n.2)).