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2017 Word of the Year

association of stars

noun
1.
Astronomy. stellar association.

stellar association

noun, Astronomy.
1.
a sparsely populated group of between 10 and 1000 young stars of similar spectral type and common origin that are moving too fast to form a permanent, gravitationally bound system.
Also called association of stars, association.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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