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