<p><strong>Noun</strong></p><ul><li>the act or process of adding or uniting.</li><li>the process of uniting two or more numbers into one sum, represented by the symbol +.</li><li>the result of adding.</li><li>something added.</li><li>a wing, room, etc., added to a building, or abutting land added to real estate already owned.</li><li>a reaction in which two or more substances combine to form another compound.</li></ul><p><strong>Synonyms</strong></p><ul><li>accession</li><li>increment</li><li>enlargement</li><li>increase</li><li>appendix</li><li>supplement</li></ul><p><strong>End of Response</strong></p>