MATER Meaning of MATER in English ma ‧ ter /ˈmeɪtə, ˈmɑː- $ ˈmeɪtər/ BrE AmE noun [countable] British English old-fashioned mother – now used humorously ⇨ pater⇨ ↑ alma mater Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012