Etymology
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castle (n.)

late Old English castel "village" (this sense from a biblical usage in Vulgar Latin); later "large building or series of connected buildings fortified for defense, fortress, stronghold" (late Old English), in this sense from Old North French castel (Old French chastel, 12c.; Modern French château), from Latin castellum "a castle, fort, citadel, stronghold; fortified village," diminutive of castrum "fort," from Proto-Italic *kastro- "part, share;" cognate with Old Irish cather, Welsh caer "town" (probably related to castrare via notion of "cut off," from PIE root *kes- "to cut"). In early bibles, castle was used to translate Greek kome "village."

Latin castrum in its plural castra was used for "military encampment, military post" and thus it came into Old English as ceaster and formed the -caster and -chester in place names. Spanish alcazar "castle" is from Arabic al-qasr, from Latin castrum. Castles in Spain "visionary project, vague imagination of possible wealth" translates 14c. French chastel en Espaigne (the imaginary castles sometimes stood in Brie, Asia, or Albania) and probably reflects the hopes of landless knights to establish themselves abroad. The statement that an (English) man's home is his castle is from 16c.

THAT the house of every man is to him as his castle and fortress, as well for his defence against injuries and violence, as for his repose .... [Edward Coke, "Semaynes Case," 1604]

castle (v.)

chess move involving the king and the rook, recorded under this name from 1650s, from castle (n.), as an old alternative name for the rook. Earlier, the verb meant "fortify (a place) with castles" (c. 1500); "provide (a ship) with fortified towers" (c. 1400); "decorate (a dish) with paper towers, etc." (late 14c.). Related: Castled; castling.

updated on December 05, 2018

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Definitions of castle from WordNet
1
castle (n.)
a large and stately mansion;
Synonyms: palace
castle (n.)
a large building formerly occupied by a ruler and fortified against attack;
castle (n.)
(chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard;
Synonyms: rook
castle (n.)
interchanging the positions of the king and a rook;
Synonyms: castling
2
castle (v.)
move the king two squares toward a rook and in the same move the rook to the square next past the king;
From wordnet.princeton.edu, not affiliated with etymonline.