irrespective of; without distinction; regardless of
Used in the pattern ...の別なく to mean 'without distinguishing between ...' or 'regardless of ...'. Often follows nouns like 年齢, 性別, 国籍, etc.
This event is open to all, irrespective of age.
Anyone can apply, regardless of gender.
Standard spelling; the kanji 別 is used with the adverbial なく.
Alternate spelling using 無 for なく; less common.
From 別 (べつ, 'distinction') + なく (adverbial form of ない, 'not'). Literally 'without distinction'.