Latin: others, and others, of others.
Most often used in citation of references. For example: Cumming, J.M., B.J. Sinclair & D.M. Wood, 1995. Homology and phylogenetic implications of male genitalia in Diptera-Eremoneura. Entomologica Scandinavica 26: 120-151 in running text will most often be cited as 'Cumming et al., 1995'.