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a full suit of armor; a complete defense or covering
Greek pan- + hopla 'armor'
1570s, from Greek panoplia "complete suit of armor," from pan- "all" (see pan-) + hopla (plural), "arms" of a hoplites ("heavily armed soldier"); see hoplite. Originally in English figurative, of "spiritual armor," etc. (a reference to Eph. vi); non-armorial sense of "any splendid array" first recorded 1829.