Meaning of CONSTANT in English

CONSTANT

[adjective] - staying the same; not getting less or moreWe've kept a fairly constant speed all journey.The fridge keeps food at a constant temperature.I've had this constant headache ever since I woke up this morning.Constant can also be used to describe things which happen very frequently.He's in constant trouble with the police.They make constant use of their computers.A constant companion/friend/lover is one who is loyal to you.

Cambridge English vocab.      Кембриджский английский словарь.