What is another word for "seal"?

Roget's Thesaurus (1911) lists these synonyms for "seal": agent, agree, agreement, air, alley, and, attest, bar, bargain, barter, between, bite, blind, block, blockade, bolt, bond, bridle, bung, button, caecal, caecum, candle, cartel, cave, caveat, charter, choke, clench, clinch, close, closure, come, compact, complete, completion, compromise, concealment, conclude, concordat.