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breakthrough

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The definition of a breakthrough is overcoming something and having an achievement.

(noun)

An example of a breakthrough is making a difficult new discovery for curing a disease.

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See breakthrough in Webster's New World College Dictionary

noun

the act, result, or place of breaking through against resistance, as in warfare
a strikingly important advance or discovery

See breakthrough in American Heritage Dictionary 4

noun

An act of overcoming or penetrating an obstacle or restriction.
A military offensive that penetrates an enemy's lines of defense.
A major achievement or success that permits further progress, as in technology.

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