# Glossary

<table><thead><tr><th width="230.33333333333331">Term</th><th>Definition</th><th>Source</th></tr></thead><tbody><tr><td>MMA</td><td>Multi-Message Aggregation</td><td></td></tr><tr><td>AMB</td><td>Arbitrary Messaging Bridges </td><td><a href="https://blog.li.fi/navigating-arbitrary-messaging-bridges-a-comparison-framework-8720f302e2aa">https://blog.li.fi/navigating-arbitrary-messaging-bridges-a-comparison-framework-8720f302e2aa</a></td></tr><tr><td>MultiMessageSender</td><td>The sender contract which lives on the source chain.</td><td></td></tr><tr><td>MultiMessageReceiver</td><td>The receiver contract which lives on the destination chain.</td><td></td></tr><tr><td>Adapters</td><td>Intermediary between each AMB endpoint and the MMA core contracts</td><td></td></tr></tbody></table>