Meaning of SEMAPHORE in English

SEMAPHORE

sem ‧ a ‧ phore /ˈseməfɔː $ -fɔːr/ BrE AmE noun [uncountable]

[ Date: 1800-1900 ; Language: Greek ; Origin: sema 'sign' + -phoros 'carrying' ]

a system of sending messages using two flags, which you hold in different positions to represent letters and numbers

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.