a small spoon generally used to stir tea, coffee, etc.

1680–90; tea + spoon

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World English Dictionary
teaspoon (ˈtiːˌspuːn)
1.  a small spoon used for stirring tea, eating certain desserts, etc
2.  Also called: teaspoonful the amount contained in such a spoon
3.  a unit of capacity used in cooking, medicine, etc, equal to about one fluid dram

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

teaspoon tea·spoon (tē'spōōn')

Abbr. tsp., tsp A measure of about 1 fluid dram or 5 milliliters.

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
Simply blend a teaspoon of originality into a bucket of the same old thing.
The role of the teaspoon is played by a small, sharp metal point placed a few
  millimetres above the blood sample.
Don't use too much-a teaspoon or two per portion should suffice-and think twice
  before using any.
Cream two tablespoons butter, and add one teaspoon white of egg.
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