[mahy-kroh-ek-uh-nom-iks, -ee-kuh-]
noun (used with a singular verb)
the branch of economics dealing with particular aspects of an economy, as the price-cost relationship of a firm.
Compare macroeconomics.

1945–50; micro- + economics

microeconomic, adjective
microeconomist [mahy-kroh-i-kon-uh-mist] , noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To microeconomics
World English Dictionary
microeconomics (ˌmaɪkrəʊˌiːkəˈnɒmɪks, -ˌɛkə-)
(functioning as singular) Compare macroeconomics the branch of economics concerned with particular commodities, firms, or individuals and the economic relationships between them

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

1948, from micro- + economics.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

microeconomics definition

Economic analysis of particular components of the economy, such as the growth of a single industry or demand for a single product. (Compare macroeconomics.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Microeconomics studies the economic behavior of individual consumers and
  individual businesses.
She needed her microeconomics textbook for the problem set she was finishing at
  the library, and she'd left it in her dorm room.
One can do a lot in microeconomics without going further than linear algebra.
Aspiring doctors are not normally taught microeconomics, cost accounting or
  risk management.
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