1.  imp(n = noun.person) brownie, elf, gremlin, hob, pixie, pixy - (folklore) fairies that are somewhat mischievous; Array
is a kind of faerie, faery, fairy, fay, sprite
has particulars: leprechaun, sandman

2.  imp(n = noun.person) monkey, rapscallion, rascal, scalawag, scallywag, scamp - one who is playfully mischievous; Array
is a kind of child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster
has particulars: brat, holy terror, little terror, terror

1.  A shoot; a scion; a bud; a slip; a graft. Chaucer. [1913 Webster]

2.  An offspring; progeny; child; scion. [1913 Webster]
"The tender imp was weaned." [1913 Webster]

3.  A young or inferior devil; a little, malignant spirit; a puny demon; a contemptible evil worker. [1913 Webster]
"To mingle in the clamorous fray
Of squabbling imps." [1913 Webster]

4.  Something added to, or united with, another, to lengthen it out or repair it, -- as, an addition to a beehive; a feather inserted in a broken wing of a bird; a length of twisted hair in a fishing line. [1913 Webster]

1.  To graft; to insert as a scion. Rom. of R. [1913 Webster]

2.  To graft with new feathers, as a wing; to splice a broken feather. [1913 Webster]
"Imp out our drooping country's broken wing." [1913 Webster]
"Who lazily imp their wings with other men's plumes." [1913 Webster]
"Here no frail Muse shall imp her crippled wing." [1913 Webster]
"Help, ye tart satirists, to imp my rage
With all the scorpions that should whip this age." [1913 Webster]

imp, n. & v.
--n.
1 a mischievous child.
2 a small mischievous devil or sprite.
--v.tr.
1 add feathers to (the wing of a falcon) to restore or improve its flight.
2 archaic enlarge; add by grafting.

Etymology:
OE impa, impe young shoot, scion, impian graft: ult. f. Gk emphutos implanted, past part. of emphuo

N  demon, daemon, demonry, demonology, evil genius, fiend, familiar, daeva, devil, bad spirit, unclean spirit, cacodemon, incubus, Eblis, shaitan, succubus, succuba, Frankenstein's monster, Titan, Shedim, Mephistopheles, Asmodeus, Moloch, Belial, Ahriman, fury, harpy, Friar Rush, vampire, ghoul, afreet, barghest, Loki, ogre, ogress, gnome, gin, jinn, imp, deev, lamia, bogie, bogeyman, bogle, nis, kobold, flibbertigibbet, fairy, brownie, pixy, elf, dwarf, urchin, Puck, Robin Goodfellow, leprechaun, Cluricaune, troll, dwerger, sprite, ouphe, bad fairy, nix, nixie, pigwidgeon, will-o'-the wisp, ghost, revenant, specter, apparition, spirit, shade, shadow, vision, hobglobin, goblin, orc, wraith, spook, boggart, banshee, loup-garou, lemures, evil eye, merman, mermaid, merfolk, siren, satyr, faun, manito, manitou, manitu, possession, demonic possession, diabolic possession, insanity, Maxwell's demon, demoniac, demonic, demonical, impish, demoniacal, fiendish, fiend-like, supernatural, weird, uncanny, unearthly, spectral, ghostly, ghost-like, elfin, elvin, elfish, elflike, haunted, pokerish, possessed, possessed by a devil, possessed by a demon, demonically.