Aside from

on or to one ; to or at a short distance apart; away from some position or direction:
to turn aside; to move the chair aside.
away from one’s thoughts or consideration:
to put one’s cares aside.
in reserve; in a separate place, as for safekeeping; apart; away:
to put some money aside for a rainy day.
away from a present group, especially for reasons of privacy; off to another part, as of a room; into or to a separate place:
he took him aside and talked business.
in spite of; put apart; notwithstanding:
all kidding aside; unusual circ-mstances aside.
a part of an actor’s lines supposedly not heard by others on the stage and intended only for the audience.
words spoken so as not to be heard by others present.
a temporary departure from a main theme or topic, especially a parenthetical comment or remark; short digression.
aside from,

apart from; besides; excluding:
aside from her salary, she receives money from investments.
except for:
they had no more food, aside from a few stale rolls.

adverb
on or to one side: they stood aside to let him p-ss
out of hearing; in or into seclusion: he took her aside to tell her of his plan
away from oneself: he threw the book aside
out of mind or consideration: he put aside all fears
in or into reserve: to put aside money for old age
(preposition) (mainly us & canadian) aside from

besides: he has money aside from his possessions
except for: he has nothing aside from the clothes he stands in compare apart (sense 7)

noun
something spoken by an actor, intended to be heard by the audience, but not by the others on stage
any confidential statement spoken in undertones
a digression
adv.

c.1300, “off to one side;” mid-14c., “to or from the side;” late 14c., “away or apart from others, out of the way,” from a- (1) + side (n.). noun sense of “words spoken so as to be (supposed) inaudible” is from 1727. middle english had asidely “on the side, indirectly” (early 15c.) and asideward “sideways, horizontal” (late 14c.).
see under apart from
see:

all joking aside
lay aside
set aside
take aside