The World of Avlis

The spell greater magic weapon uses the word (enhancement). Magic weapons use this term. Does this mean that greater magic weapon gives a +1 to attack and a +1 to damage per every 5 caster levels

Yes, it effectively makes your weapon a magic weapon for the duration with the appropriate bonuses to attack and damage based on level.

thanks prety cool.

Does that mean that your normal magical item enhancements are not stacking with this spell, since its a higher enhancement plus then the one ya got, or will it stack with GMW.

Does not stack.