"authority to command the national military forces," in extended use "an empire," 1650s, from Latin imperium "command, supreme authority, power" (see empire). Hence Latin phrase imperium in imperio "a state within a state."
"convivial evening social visit," typically with traditional music, 1868, from Irish céilidhe, from Old Irish céle "companion," from PIE *kei-liyo-, suffixed form of root *kei- (1) "beloved, dear," primarily "to lie; bed, couch."
masc. proper name, English form of Caspar or of Gaspar, the traditional name of one of the Three Kings. Said by Klein to be of Persian origin and meaning literally "treasure-holder." Used from 1896 for "a rustic simpleton."
traditional dance of Hawaii, 1825, from Hawaiian. As a verb from 1952. Hula hoop first recorded in fall of 1958, when it was a craze; so called from resemblance of motions of one using it to the dancers' hip circles.
"eat the evening meal," c. 1300, from Old French super, soper "dine, sup, dip bread in soup or wine, sop up" (Modern French souper), which probably is from soupe "broth" (see soup), until recently still the traditional evening meal of French workers.