Source : Webster's Revised Unabridged Dictionary (1913)

Kneel \Kneel\, v. i. [imp. & p. p. {Knelt}or {Kneeled} (?); p.
   pr. & vb. n. {Kneeling}.] [OE. knelen, cneolien; akin to D.
   knielen, Dan. kn[ae]le. See {Knee}.]
   To bend the knee; to fall or rest on the knees; -- sometimes
   with down.

         And he kneeled down, and cried with a loud voice, Lord,
         lay not this sin to their charge.        --Acts vii.
                                                  60.

         As soon as you are dressed, kneel and say the Lord's
         Prayer.                                  --Jer. Taylor.

Knelt \Knelt\, imp. & p. p.
   of {Kneel}.

Source : WordNet®

kneel
     n : supporting yourself on your knees [syn: {kneeling}]
     v : rest one's weight on one's knees; "In church you have to
         kneel during parts of the service"
     [also: {knelt}]

knelt
     See {kneel}