skill

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

• noun Proficiency, facility, or dexterity that is acquired or developed through training or experience.
• noun A developed talent or ability.
• noun An art, trade, or technique, particularly one requiring use of the hands or body.
• noun Obsolete A reason; a cause.

from The Century Dictionary.

• To set apart; separate.
• Hence, to discern; have knowledge or understanding (to); know how: usually with an infinitive.
• To have perception or comprehension; have understanding; discern: followed by of or on.
• To have personal and practical knowledge (of); be versed or practised; hence, to be expert or dexterous: commonly followed by of.
• To make difference; signify; matter: used impersonally, and generally with a negative.
• noun The discriminating or reasoning faculty; the mind.
• noun Discriminative power; discernment; understanding; reason; wit.
• noun Reasonableness; propriety; rightness; justice; proper course; wise measure; also, rightful claim; right.
• noun Reasoning; argument; proof; also, cause; reason.
• noun Practical knowledge and ability; power of action or execution; readiness and excellence in applying wisdom or science to practical ends; expertness; dexterity.
• noun A particular power, ability, or art; a gift or attainment; an accomplishment.
• noun That for which one is specially qualified; one's forte.
• noun Synonyms Facility, knack. See adroit.

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

• intransitive verb obsolete To be knowing; to have understanding; to be dexterous in performance.
• intransitive verb To make a difference; to signify; to matter; -- used impersonally.
• noun obsolete Discrimination; judgment; propriety; reason; cause.
• noun obsolescent Knowledge; understanding.
• noun The familiar knowledge of any art or science, united with readiness and dexterity in execution or performance, or in the application of the art or science to practical purposes; power to discern and execute; ability to perceive and perform; expertness; aptitude
• noun obsolete Display of art; exercise of ability; contrivance; address.
• noun obsolete Any particular art.
• transitive verb obsolete To know; to understand.

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

• verb transitive To set apart; separate.
• verb transitive To discern; have knowledge or understanding; to know how (to).
• verb intransitive To have knowledge or comprehension; discern.
• verb intransitive To have personal or practical knowledge of; be versed or practised; be expert or dextrous.
• verb intransitive, archaic To make a difference; signify; matter.
• noun Capacity to do something well; technique, ability. Skills are usually acquired or learned, as opposed to abilities, which are often thought of as innate.
• adjective UK, slang great, excellent

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

• noun an ability that has been acquired by training
• noun ability to produce solutions in some problem domain