Etymology
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interest (n.)

mid-15c., "legal claim or right; a concern; a benefit, advantage, a being concerned or affected (advantageously)," from Old French interest "damage, loss, harm" (Modern French intérêt), from noun use of Latin interest "it is of importance, it makes a difference," third person singular present of interresse "to concern, make a difference, be of importance," literally "to be between," from inter "between" (see inter-) + esse "to be" (from PIE root *es- "to be"). The sense development to "profit, advantage" in French and English is not entirely clear.

The earlier Middle English word was interesse (late 14c.), from Anglo-French interesse "what one has a legal concern in," from Medieval Latin interesse "compensation for loss," noun use of Latin interresse (compare German Interesse, from the same Medieval Latin source).

Financial sense of "money paid for the use of money lent" (1520s) earlier was distinguished from usury (illegal under Church law) by being in reference to "compensation due from a defaulting debtor." Sense of "personal or selfish consideration" is from 1620s. Meaning "business in which several people are interested" is from 1670s. Meaning "curiosity, feeling that something concerns one, appreciative or sympathetic regard" is first attested 1771. Interest group is attested from 1907; interest rate by 1868.

interest (v.)

"cause to be interested, engage the attention of," c. 1600, earlier interesse (1560s), from the noun (see interest (n.)). Perhaps also from or influenced by interess'd, past participle of interesse.

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Definitions of interest
1
interest (n.)
a sense of concern with and curiosity about someone or something;
an interest in music
Synonyms: involvement
interest (n.)
a reason for wanting something done;
in the common interest
in the interest of safety
Synonyms: sake
interest (n.)
the power of attracting or holding one's attention (because it is unusual or exciting etc.);
primary colors can add interest to a room
they said nothing of great interest
Synonyms: interestingness
interest (n.)
a fixed charge for borrowing money; usually a percentage of the amount borrowed;
how much interest do you pay on your mortgage?
interest (n.)
(law) a right or legal share of something; a financial involvement with something;
they have interests all over the world
Synonyms: stake
interest (n.)
(usually plural) a social group whose members control some field of activity and who have common aims;
the iron interests stepped up production
Synonyms: interest group
interest (n.)
a diversion that occupies one's time and thoughts (usually pleasantly);
he counts reading among his interests
Synonyms: pastime / pursuit
2
interest (v.)
excite the curiosity of; engage the interest of;
interest (v.)
be on the mind of;
Synonyms: concern / occupy / worry
interest (v.)
be of importance or consequence;
Synonyms: matter to
From wordnet.princeton.edu