A1 Meaning of A1 in English I. A1 /ˌeɪ ˈwʌn/ BrE AmE the A1 a main British road that goes from London to EdinburghII. A1, the /ˌeɪ ˈwʌn/ BrE AmE a main British road that goes from London to Edinburgh Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012