Meaning of “high” - Learner’s Dictionary

high

adjective uk us /haɪ/
TALL

A2 having a large distance from the bottom to the top:

ABOVE GROUND

B1 a large distance above the ground or the level of the sea:

a high shelf/window
The village was high up in the mountains.
MEASUREMENT

used to say how big the distance is from the top of something to the bottom, or how far above the ground something is:

How high is it?
It's ten metres high.
AMOUNT

B1 great in amount, size, or level:

The car sped away at high speed.
VERY GOOD

B1 very good:

IMPORTANT

B2 important, powerful, or at the top level of something:

a high rank
Safety is our highest priority.
DRUGS

If someone is high, they are behaving in an unusual way because they have taken an illegal drug:

The whole band seemed to be high on heroin.
SOUND

A high sound or note is near the top of the set of sounds that people can hear.

high in sth

If a food is high in something, it contains a lot of it:

Avoid foods that are high in salt.

(Definition of “high adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)