Half-yearly a. : Two in a year; semiannual. -- adv. Twice in a year; semiannually.

Example:
compound Interest half yearly and quarterly?

Taxonomy
dictionary, AskOxford, half-yearly, the Compact Oxford English Dictionary, the Experts, English dictionary, the Little Oxford Dictionary of Quotations, First Names, UK Book, Book Catalogue, UK view, adjective, adverb, intervals, six months, phrases, definitions, Copyright Oxford University Press.

Defination from the web:
half-yearly. • adjective & adverb at intervals of six months. Perform another search of the Compact Oxford English Dictionary ...