Meaning of CONSTANT in English

CONSTANT

I. ˈkän(t)-stənt adjective

Etymology: Middle English, from Middle French, from Latin constant-, constans, from present participle of constare to stand firm, be consistent, from com- + stare to stand — more at stand

Date: 14th century

1. : marked by firm steadfast resolution or faithfulness : exhibiting constancy of mind or attachment

a constant friend

2. : invariable , uniform

a constant flow

3. : continually occurring or recurring : regular

a constant annoyance

Synonyms: see faithful , continual

• con·stant·ly adverb

II. noun

Date: 1832

: something invariable or unchanging: as

a. : a number that has a fixed value in a given situation or universally or that is characteristic of some substance or instrument

b. : a number that is assumed not to change value in a given mathematical discussion

c. : a term in logic with a fixed designation

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.