Skill

A skill is the ability to carry out a task with pre-determined results often within a given amount of time, energy, or both.

Quotes
μήτι δ' αὖτε κυβερνήτης ἐνὶ οἴνοπι πόντῳ νῆα θοὴν ἰθύνει ἐρεχθομένην ἀνέμοισι· μήτι δ' ἡνίοχος περιγίγνεται ἡνιόχοιο. It is by skill that the sea captain holds his rapid ship on its course, though torn by winds, over the wine-blue water. By skill charioteer outpasses charioteer.
 * Μήτι τοι δρυτόμος μέγ' ἀμείνων ἠὲ βίηφι·
 * The woodcutter is far better for skill than he is for brute strength.
 * Homer, The Iliad, Book XXIII, lines 315–318 (tr. Richmond Lattimore)