expression
other than; except for; aside from
Used to exclude something from a statement, often in the pattern 「~は別として」 meaning 'leaving aside ~' or 'apart from ~'.
冗談は別として、本当に大丈夫ですか。
Joking aside, are you really okay?
この点を別として、計画は完璧だ。
Apart from this point, the plan is perfect.