Alternative form of high definition

(aviation) Operating in hot climates and at high altitude.

plural of sugar high

Of very good quality.

In high spirits; cheerful.

plural of high society

The range of an unspecified number between 100 and 200 that is rather close to 200 than 100, as opposed to low hundreds and mid hundreds.

(rare, childish) An apostrophe.

fast, quick

(uncountable) A subgenre of fantasy fiction set in a secondary world or fantasy world as opposed to the primary world or real world.