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You can choose to take a –1 penalty on melee attack rolls and combat maneuver checks to gain a +1 dodge bonus to your Armor Class. When your base attack bonus reaches +4, and every +4 thereafter, the penalty increases by –1 and the dodge bonus increases by +1. You can only choose to use this feat when you declare that you are making an attack or a full-attack action with a melee weapon. The effects of this feat last until your next turn.
Where it says that it must be used with "an attack or full attack action" should it be read "an attack, or full attack action" or "an attack (action) or full attack action"?
My understanding had been that it could be activated whenever you made a melee attack, including an Attack of Opportunity, just like Power Attack, but I've discovered that there is a fairly prevalent understanding that it can only be used with an attack action (like Vital Strike) or full attack.