a·side 
(ə-sīd)
(ə-sīd)adv.
1. To or toward the side: step aside.
2. Out of one's thoughts or mind: put my doubts aside.
3. Apart: a day set aside for relaxing.
4. In reserve; away: put a little money aside.
prep.
Being excepted or excluded from consideration: All joking aside, can you swim two miles?
n.
1. A piece of dialogue intended for the audience and supposedly not heard by the other actors on stage.
2. A remark made in an undertone so as to be inaudible to others nearby.
3. A parenthetical departure; a digression.