From Longman Dictionary of Contemporary Englishet alet al /ˌet ˈæl/ adverb TCNLISTwritten after a list of names to mean that other people are also involved in something Boers et al, 2001
Examples from the Corpus
et al• The exhibition will include works from Picasso, Pollock, Warhol, et al.From Longman Business Dictionaryet alet al /ˌet ˈæl/ adverb written used after a name or list of names to mean that other people are also involved in something, for example the writing of a report, article etcthe ‘Time for Action’ study by Godlove et al 