What is another word for "annexation"?

Roget's Thesaurus (1911) lists these synonyms for "annexation": accession, accompaniment, accrue, add, addition, adjection, advene, affix, annex, append, augment, become, clap, increase, increment, ingraft, insert, insertion, interpose, interposition, introduce, junction, reenforce, reinforce, reinforcement, restrengthen, saddle, sprinkle, subjoin, superadd, superaddition, superfetation, superpose, superposition, supervene, supplement, swell, tack, tag, the.