key

KEY noun

[ C ] uk/kiː/ us key noun [C]
(METHOD)

B1 a way of explaining or achieving something

ключ, путь
Hard work is the key to success. key noun [C]
(MUSIC)

a set of musical notes based on one particular note

ключ, тональность
the key of D major key noun [C]
(ANSWERS)

A2 a list of answers to an exercise or game

ответы
Смотрите такжеunder lock and key
key adjective uk/kiː/ us
B2 very important in influencing or achieving something

ключевой
a key factor