Every distinct wording since 2010, newest first.
July 12, 2019 · Core Set 2020
An ability can be something that a player has that changes how the game affects the player. A player normally has no abilities unless granted to that player by effects.
February 1, 2010 · Worldwake
Aura spells are always targeted. These are the only permanent spells with targets. An Aura's target is specified by its enchant keyword ability (see rule 702.5, "Enchant"). The target(s) are chosen as the spell is cast; see rule 601.2c. An Aura permanent doesn't target anything; only the spell is targeted. (An activated or triggered ability of an Aura permanent can also be targeted.)