1. The attainment of a dignity or rank: the queen's accession to the throne.
a. Something that has been acquired or added; an acquisition.
b. An increase by means of something added.
a. The addition to or increase in value of property by means of improvements or natural growth.
b. The right of a proprietor to ownership of such addition or increase.
4. Agreement or assent.
5. Access; admittance.
6. A sudden outburst.
tr.v. ac·ces·sioned, ac·ces·sion·ing, ac·ces·sions
To record in the order of acquisition: a curator accessioning newly acquired paintings.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.