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tr.v. im·mersed, im·mers·ing, im·mers·es
1. To cover completely in a liquid; submerge.
2. To baptize by submerging in water.
3. To engage wholly or deeply; absorb: scholars who immerse themselves in their subjects.
[From Middle English immersed, embedded deeply, from Latin immersus, past participle of immergere, to immerse : in-, in; see in-2 + mergere, to dip.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. sunk or submerged
2. (of plants) growing completely submerged in water
3. (Biology) (of a plant or animal organ) embedded in another organ or part
4. involved deeply; engrossed
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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adjective engrossed, involved, absorbed, deep, busy, occupied, taken up, buried, consumed, wrapped up, bound up, rapt, spellbound, mesmerized, in a brown study He's really becoming immersed in his work.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002