What is another word for "coefficient"?

Roget's Thesaurus (1911) lists these synonyms for "coefficient": accessory, accompaniment, accompany, action, addition, adjunct, along, and, appendage, appurtenance, arm, associate, associated, association, attend, attendant, attribute, back, bear, boat, body, boomerang, bounce, bound, bring, cheek, coefficiency, coexist, coexistence, colleague, collectively, collision, comes, companion, companionship, company, concomitance, concomitant, consort, context.