alter

[awl-ter]
verb (used with object)
1.
to make different in some particular, as size, style, course, or the like; modify: to alter a coat; to alter a will; to alter course.
2.
to castrate or spay.
verb (used without object)
3.
to change; become different or modified.

Origin:
1350–1400; Middle English < Old French alterer < Late Latin alterāre to change, worsen, derivative of Latin alter other

alterer, noun
half-altered, adjective
prealter, verb (used with object)
realter, verb
unaltering, adjective
well-altered, adjective

altar, alter.


1. See adjust, change.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
alter (ˈɔːltə)
 
vb
1.  to make or become different in some respect; change
2.  informal chiefly (US) (tr) castrate a euphemistic word for spay
 
[C14: from Old French alterer, from Medieval Latin alterāre to change, from Latin alter other]
 
'alterable
 
adj
 
'alterably
 
adv
 
altera'bility
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

alter
late 14c., "to change (something)," from O.Fr. alterer, from M.L. alterare "to change," from L. alter "the other (of the two)," from PIE *al- "beyond" + comp. suffix -ter (cf. other). Intransitive sense "to become otherwise" first recorded 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ALT (ā'ěl-tē')
n.
Alanine aminotransferase; an enzyme in serum and body tissues that catalyzes the transfer of amino acid groups from l-alanine to 2-ketoglutarate or the reverse, thus allowing nitrogen to be excreted or incorporated into other compounds.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Altering the ecosystem in your garden isn't always an option.
In fact, he says, it may be impossible for humans or any other animal to bring
  a memory to mind without altering it in some way.
By altering the rate, on the contrary, the proportion between those two values
  is necessarily altered.
The nature of things has stamped upon corn a real value which cannot be altered
  by merely altering its money price.
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