knack

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A special talent or skill, especially one difficult to explain or teach.
• noun A tendency or pattern of behavior.
• noun A clever trick.
• noun A knickknack.

from The Century Dictionary.

• To crack, make a sharp abrupt noise; specifically, to gnash the teeth; make a champing sound.
• To speak affectedly or mincingly.
• To talk in a lively manner; narrate.
• To cause, to sound.
• To sneer; taunt; mock.
• noun A crack or snap; a sharp sound; a snap with the finger or finger-nail.
• noun A dexterous exploit; a trick; a device; a mockery; a repartee.
• noun Readiness; habitual facility of performance; dexterity; adroitness.
• noun An ingenious trifle; a toy; a knickknack.
• noun A kind of figure made of a small quantity of corn at the end of the harvest, and carried in the harvest-home procession.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb Obs. or Prov. Eng. To crack; to make a sharp, abrupt noise to chink.
• intransitive verb Prov. Eng. To speak affectedly.
• noun A petty contrivance; a toy; a plaything; a knickknack.
• noun A readiness in performance; aptness at doing a specific task; skill; aptitude; facility; dexterity; -- often used with for.
• noun Something performed, or to be done, requiring aptness and dexterity; a trick; a device.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A readiness in performance; aptness at doing something; skill; facility; dexterity.
• noun A petty contrivance; a toy; a plaything; a knickknack.
• noun Something performed, or to be done, requiring aptness and dexterity; a trick; a device.
• verb To crack; to make a sharp, abrupt noise to chink.
• verb To speak affectedly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a special way of doing something