Alternative spelling of twenty-one

Relating to a historical tendency for a language (such as English) to reduce its use of inflection. / Relating to the merging of two ideals, organizations or languages into one.

(organic chemistry) Having a halogenobenzyl, a halogeno derivative of a benzylic radical

(transitive) To make less neutral than required or expected, or (chemistry) closer to the neutral pH value without reaching it.