Meaning of MAST in English

mast /mɑːst $ mæst/ BrE AmE noun [countable]

[ Language: Old English ; Origin: mæst ]

1 . a tall pole on which the sails or flags on a ship are hung

2 . British English a tall metal tower that sends out radio and television signals:

a radio mast

3 . a tall pole on which a flag is hung

⇨ ↑ half-mast

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