Meaning of CONSTANT in English

CONSTANT

/ ˈkɒnstənt; NAmE ˈkɑːn-/ adjective , noun

■ adjective

1.

[ usually before noun ] happening all the time or repeatedly :

constant interruptions

a constant stream of visitors all day

Babies need constant attention.

This entrance is in constant use.

2.

that does not change

SYN fixed :

travelling at a constant speed of 50 m.p.h.

■ noun

( technical ) a number or quantity that does not vary

OPP variable

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WORD ORIGIN

late Middle English (in the sense staying resolute or faithful ): from Old French , from Latin constant- standing firm, from the verb constare , from con- with + stare stand. The noun senses date from the mid 19th cent.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.