Definition of knight noun from the Oxford Advanced Learner's Dictionary

     

    knight

     noun
    noun
    BrE BrE//naɪt//
     
    ; NAmE NAmE//naɪt//
     
     
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  1. 1(in the Middle Ages) a man of high social rank who had a duty to fight for his king. Knights are often shown in pictures riding horses and wearing armour. tales of medieval knights errant, wandering in search of chivalrous adventures see also black knight, white knight
  2. 2 (in Britain) a man who has been given a special honour by the king or queen and has the title Sir before his name compare baronet
  3. 3 a piece used in the game of chess that is shaped like a horse’s head More Like This Silent letters gnarled, gnash, gnat, gnaw, gnome haute cuisine, heir, (NAmE herb), honour, hors d’oeuvre, hour knack, knee, kneel, knife, knight, knit, knob, knock, knot, know, knuckle psalm, psephology, psychic, ptarmigan, pterodactyl, psychology wrangle, wrap, wreath, wreck, wrench, wrestle, wriggle, wring, write, wrong bomb, climb, crumb, doubt, lamb, limb ascent, fascinate, muscle, scene, scissors height, right, sleigh, weight align, campaign, design, foreign, malign, reign, unfeigned balmy, calm, calf, half, yolk autumn, column, condemn, damn, hymn, solemn bristle, fasten, listen, mortgage, soften, thistle, wrestle biscuit, build, circuit, disguise, guilty, league, rogue, vague yacht answer, sword, twoSee worksheet.
  4. Word Origin Old English cniht ‘boy, youth, servant’, of West Germanic origin; related to Dutch knecht and German Knecht. Sense (2) dates from the mid 16th cent.Idioms
    a knight in shining armour
     
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    (usually humorous) a man who saves somebody, especially a woman, from a dangerous situation She’s still waiting for a knight in shining armour/armor to come and rescue her.
See the Oxford Advanced American Dictionary entry: knight