What is Constant?

Constant definition and meaning on Dictionary terms:

not changing or varying; uniform; regular; invariable: All conditions during the three experiments were constant.
continuing without pause or letup; unceasing: constant noise.
regularly recurrent; continual; persistent: He found it impossible to work with constant interruption.
faithful; unswerving in love, devotion, etc.: a constant lover.
steadfast; firm in mind or purpose; resolute.
Obsolete. certain; confident.