1
: a complex structure of interdependent and subordinate elements whose relations and properties are largely determined by their function in the whole
The nation is not merely the sum of individual citizens at any given time, but it is a living organism, a mystical body … of which the individual is an ephemeral part …Joseph Rossi
2
: an individual constituted to carry on the activities of life by means of parts or organs more or less separate in function but mutually dependent : a living being
a multicellular organism

Examples of organism in a Sentence

A human being is a complex organism.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Oaks support a wide range of organisms, anchoring entire ecosystems, and also serve the vital task of storing carbon on a warming planet. Jessie Schiewe, Los Angeles Times, 19 Sep. 2026 Do note that soils, unless sterilized, contain weed seeds and organisms which are ready to affect plant growth. Tom MacCubbin, The Orlando Sentinel, 19 Sep. 2026 Applying the full reprogramming process to an adult organism would be dangerous because the resulting pluripotent cells could form tumors known as teratomas. Venki Ramakrishnan, Scientific American, 15 Sep. 2026 Over the years, scientists have changed some common and Latin names of certain organisms. Sheryl Devore, Chicago Tribune, 15 Sep. 2026 See All Example Sentences for organism

Word History

First Known Use

circa 1774, in the meaning defined at sense 1

Time Traveler
The first known use of organism was circa 1774

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Cite this Entry

“Organism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/organism. Accessed 20 Sep. 2026.

Kids Definition

1
: something having many related parts that function together as a whole
2
: an individual living thing that carries on the activities of life by means of organs which have separate functions but are dependent on each other : a living person, plant, or animal

Medical Definition

: an individual constituted to carry on the activities of life by means of organs separate in function but mutually dependent : a living being
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