a person who performs juggling feats, as with balls or knives.
2.
a person who deceives by trickery; trickster.
Origin: bef. 1100; ME jogelour, jogeler, jugelour < AF jogelour, jugelur, OF jogleor, jougleor (see jongleur) ≪ L joculātor joker, equiv. to joculā(rī) (see juggle) + -tor-tor; r. OE gēogelere magician, c. G Gaukler, both directly < L, as above
c.1100, iugulere "jester, buffoon," also "wizard, sorcerer," from O.E. geogelere "magician, conjurer," also from Anglo-Fr. jogelour, from O.Fr. jogleor (acc.), from L. joculatorem (nom. joculator) "joker," from joculari "to joke." Connecting notion between "magician" and "juggler" is dexterity.
[juhg-ler] 
lər