(uncountable) A cheerful attitude; happiness; a good, happy, or positive mood.

(now uncountable) That which promotes good spirits or cheerfulness, especially food and entertainment prepared for a festive occasion.

(countable) A cry expressing joy, approval or support, such as "hurrah".

(countable) A chant made in support of a team at a sports event.

(chiefly Canada, US) Cheerleading, especially when practiced as a competitive sport.

(transitive) To gladden; to make cheerful; often with up.

(transitive) To infuse life, courage, animation, or hope, into; to inspirit; to solace or comfort.

(transitive, intransitive) To applaud or encourage with cheers or shouts.

(transitive, figurative) To feel or express enthusiasm for (something).