verb (used with object), infused, infusing.
to introduce, as if by pouring; cause to penetrate; instill (usually followed by into ): The energetic new principal infused new life into the school.
to imbue or inspire (usually followed by with ): The new coach infused the team with enthusiasm.
to steep or soak (leaves, bark, roots, etc.) in a liquid so as to extract the soluble properties or ingredients.
Obsolete. to pour in.
verb (used without object), infused, infusing.
to undergo infusion; become infused: Leave the solution to infuse overnight.

1375–1425; late Middle English < Latin infūsus past participle of infundere to pour into. See in-2, fuse2

infuser, noun
reinfuse, verb (used with object), reinfused, reinfusing.
superinfuse, verb (used with object), superinfused, superinfusing.
uninfused, adjective
uninfusing, adjective

1. ingrain; inculcate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infuse (ɪnˈfjuːz)
vb (often foll by into) (foll by with)
1.  to instil or inculcate
2.  to inspire; emotionally charge
3.  to soak or be soaked in order to extract flavour or other properties
4.  rare (foll by into) to pour
[C15: from Latin infundere to pour into]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., "to pour in," from L. infusus, pp. of infundere "to pour into," from in- "in" + fundere "pour, spread" (see found (2)). Figurative sense of "instill, inspire" first recorded 1520s (infusion in this sense dates from mid-15c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

infuse in·fuse (ĭn-fyoōz')
v. in·fused, in·fus·ing, in·fus·es

  1. To steep or soak without boiling in order to extract soluble elements or active principles.

  2. To introduce a solution into the body through a vein for therapeutic purposes.

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
Soak the rinds of your citrus fruits in water for several days to infuse the
  scent in the water.
Infuse is widely used in civilian hospitals and trauma centers around the
  country for spinal surgeries and to treat broken bones.
Colleges need to infuse other disciplines with science and engineering skills.
Hydrothermal vents on the planet's seafloor may infuse the alien ocean with
  chemical energy sources.
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