What is another word for "interpose"?

Roget's Thesaurus (1911) lists these synonyms for "interpose": accession, accompaniment, accrue, add, addition, adjection, advene, affix, annex, annexation, append, arbitrate, arbitration, arbitrator, augment, bargain, become, clap, compromise, consignee, diplomacy, diplomatics, diplomatist, flag, go-between, good, halfway, increase, increment, ingraft, insert, insertion, intercede, intercession, intercessor, interfere, interference, intermeddling, interposition, intervene.