et al (Adverb) — And others ('et al.' is used as an abbreviation of 'et alii' (masculine plural) or 'et aliae' (feminine plural) or 'et alia' (neuter plural) when referring to a number of people). ex. "the data reported by Smith et al."
et al (Adverb) — And elsewhere (used when referring to other occurrences in a text).