A noun "high" represents a high point or position, whether literal or figurative, and can also refer to the maximum atmospheric temperature recorded at a particular location.

A period of euphoria, from excitement or from an intake of drugs.

A drug that gives such a high.

(meteorology, informal) A large area of elevated atmospheric pressure; an anticyclone.

(card games) The highest card dealt or drawn.

Physically elevated, extending above a base or average level, either very elevated or relatively elevated, and can also refer to a baseball ball above the batter's shoulders or pertain to a language spoken in a more mountainous region.

Having a specified elevation or height; tall.

An adjective "high" represents something that is elevated in status, importance, or development, exalted in rank or character, of great consequence, consummate or advanced to the utmost extent, and potentially abstract or difficult to comprehend.

Elevated in mood; marked by great merriment, excitement, etc.

(of a lifestyle) Luxurious; rich.

Lofty, often to the point of arrogant, haughty, boastful, proud.

(with "on" or "about") Keen, enthused.

(of a body of water) With tall waves.

Remote (to the north or south) from the equator; situated at (or constituting) a latitude which is expressed by a large number.

An adjective "high" is used to describe something that is large or great in amount, quantity, value, force, energy, etc., and can also refer to having a large concentration of a substance.

(acoustics) Acute or shrill in pitch, due to being of greater frequency, i.e. produced by more rapid vibrations (wave oscillations).

(phonetics) Made with some part of the tongue positioned high in the mouth, relatively close to the palate.

(card games) An adjective "high" represents something that is greater in value than others, has the highest rank in a specific sequence, and is able to win or be successful.

(of meat, especially venison) Strong-scented; slightly tainted/spoiled; beginning to decompose.

(informal) Intoxicated; under the influence of a mood-altering drug, formerly usually alcohol, but now (from the mid-20th century) usually not alcohol but rather marijuana, cocaine, heroin, etc.

(nautical, of a sailing ship) Near, in its direction of travel, to the (direction of the) wind.

(sports such as soccer) Positioned up the field, towards the opposing team's goal.

In or to an elevated position.

In or at a great value.

At a pitch of great frequency.