Definition of noscitur a sociis in US English:

noscitur a sociis

noun

  • Law. The doctrine that if the meaning of a word is doubtful, it shall be taken to agree with the context of the surrounding words.

Origin

Mid 18th century (in an earlier sense). From post-classical Latin noscitur a sociis he is known from his companions from classical Latin nōscitur, 3rd singular present passive indicative of nōscere to know + ā by, from + sociīs, ablative plural of socius companion.