verb (used with object)
to supply with riches, wealth, abundant or valuable possessions, etc.: Commerce enriches a nation.
to supply with abundance of anything desirable: to enrich the mind with knowledge.
to add greater value or significance to: Art enriches life.
to adorn or decorate: a picture frame enriched with gold.
to make finer in quality, as by supplying desirable elements or ingredients: to enrich soil.
to increase the proportion of a valuable mineral or isotope in (a substance or material): The fuel was enriched with uranium 235 for the nuclear reactor.
to restore to (a food) a nutrient that has been lost during an early stage of processing: to enrich flour with thiamine, iron, niacin, and riboflavin.
to add vitamins and minerals to (food) to enhance its nutritive value.

1350–1400; Middle English enrichen < Old French enrichir. See en-1, rich

enricher, noun
enrichingly, adverb
self-enriching, adjective
unenriched, adjective
unenriching, adjective

3. elevate, improve, enhance, endow.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
enrich (ɪnˈrɪtʃ)
1.  to increase the wealth of
2.  to endow with fine or desirable qualities: to enrich one's experience by travelling
3.  to make more beautiful; adorn; decorate: a robe enriched with jewels
4.  to improve in quality, colour, flavour, etc
5.  to increase the food value of by adding nutrients: to enrich dog biscuits with calcium
6.  to make (soil) more productive, esp by adding fertilizer
7.  physics to increase the concentration or abundance of one component or isotope in (a solution or mixture); concentrate: to enrich a solution by evaporation; enrich a nuclear fuel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., "to make wealthy," from O.Fr. enrichir, from en- "make, put in" + riche "rich" (see rich). Scientific sense of "to increase the abundance of a particular isotope in some material" is first attested 1945. Related: Enriched; enriching.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Both are offering proposals to enrich retirement accounts, improve the educational system, and reduce taxes for working people.
It is essential, however, to provide a balance of opportunities for students to
  explore and enrich their lives.
Meanwhile, it will continue to enrich uranium, getting ever closer to the point
  where it will be able to make a nuclear bomb.
The intrinsic motivation of learning to enrich one's life seems wanting.
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