[in-ter-uh-stid, -truh-stid, -tuh-res-tid]
having an interest in something; concerned: Interested members will meet at noon.
having the attention or curiosity engaged: an interested spectator.
characterized by a feeling of interest.
influenced by personal or selfish motives: an interested witness.
participating; having an interest or share; having money involved.

1655–65; interest + -ed3 or -ed2

interestedly, adverb
interestedness, noun
overinterested, adjective
overinterestedly, adverb
overinterestedness, noun
quasi-interested, adjective
quasi-interestedly, adverb
well-interested, adjective Unabridged


[in-ter-ist, -trist]
the feeling of a person whose attention, concern, or curiosity is particularly engaged by something: She has a great interest in the poetry of Donne.
something that concerns, involves, draws the attention of, or arouses the curiosity of a person: His interests are philosophy and chess.
power of exciting such concern, involvement, etc.; quality of being interesting: political issues of great interest.
concern; importance: a matter of primary interest.
a business, cause, or the like in which a person has a share, concern, responsibility, etc.
a share, right, or title in the ownership of property, in a commercial or financial undertaking, or the like: He bought half an interest in the store.
a participation in or concern for a cause, advantage, responsibility, etc.
a number or group of persons, or a party, financially interested in the same business, industry, or enterprise: the banking interest.
interests, the group of persons or organizations having extensive financial or business power.
the state of being affected by something in respect to advantage or detriment: We need an arbiter who is without interest in the outcome.
benefit; advantage: to have one's own interest in mind.
regard for one's own advantage or profit; self-interest: The partnership dissolved because of their conflicting interests.
influence from personal importance or capability; power of influencing the action of others.
a sum paid or charged for the use of money or for borrowing money.
such a sum expressed as a percentage of money borrowed to be paid over a given period, usually one year.
something added or thrown in above an exact equivalent: Jones paid him back with a left hook and added a right uppercut for interest.
verb (used with object)
to engage or excite the attention or curiosity of: Mystery stories interested him greatly.
to concern (a person, nation, etc.) in something; involve: The fight for peace interests all nations.
to cause to take a personal concern or share; induce to participate: to interest a person in an enterprise.
to cause to be concerned; affect.
in the interest(s) of, to the advantage or advancement of; in behalf of: in the interests of good government.

1225–75; (noun) Middle English < Medieval Latin, Latin: it concerns, literally, it is between; replacing interesse < Medieval Latin, Latin: to concern, literally, to be between; (v.) earlier interess as v. use of the noun; see inter-, esse

overinterest, noun
preinterest, noun, verb
reinterest, noun, verb (used with object) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interest (ˈɪntrɪst, -tərɪst)
1.  the sense of curiosity about or concern with something or someone: an interest in butterflies
2.  the power of stimulating such a sense: to have great interest
3.  the quality of such stimulation
4.  something in which one is interested; a hobby or pursuit
5.  (often plural) benefit; advantage: in one's own interest
6.  (often plural)
 a.  a right, share, or claim, esp in a business or property
 b.  the business, property, etc, in which a person has such concern
7.  a.  a charge for the use of credit or borrowed money
 b.  such a charge expressed as a percentage per time unit of the sum borrowed or used
8.  (often plural) a section of a community, etc, whose members have common aims: we must not offend the landed interest
9.  declare an interest to make known one's connection, esp a prejudicial connection, with an affair
10.  to arouse or excite the curiosity or concern of
11.  to cause to become involved in something; concern
[C15: from Latin: it concerns, from interesse; from inter- + esse to be]

interested (ˈɪntrɪstɪd, -tərɪs-)
1.  showing or having interest
2.  (usually prenominal) personally involved or implicated: the interested parties met to discuss the business

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., earlier interesse (late 14c.), from Anglo-Fr. interesse "what one has a legal concern in," from M.L. interesse "compensation for loss," from L. interresse "to concern, make a difference, be of importance," lit. "to be between," from inter- "between" + esse "to be." Form influenced 15c. by
O.Fr. interest "damage," from L. interest "it is of importance, it makes a difference," third pers. sing. present of interresse. Financial sense of "money paid for the use of money lent" (1529) earlier was distinguished from usury (illegal under Church law) by being in ref. to "compensation due from a defaulting debtor." Meaning "curiosity" is first attested 1771.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

interest definition

The charge for borrowing money or the return for lending it.

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
It's become clear to her that he is not romantically interested.
Students should be encouraged by teachers to learn about what they are
  interested in and what they are skillful in.
The ultimate goal is to get students interested in science and math.
But almost any technical photographic challenge interested him.
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