What is another word for "half"?

Roget's Thesaurus (1911) lists these synonyms for "half": abate, abatement, abstract, ace, agio, allow, allowance, alone, anastatic, and, apart, aquatint, aquatinta, arrear, atomic, autotype, azygous, backwardation, bargain, bate, beat, below, bite, block, break, bur, burin, business, but, caret, cerograph, cerography, chalcography, chalk, chromolithograph, chromolithography, circle, color, combine, compact.