Etymology
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breakthrough (n.)

also break-through, 1918, in a military sense, from the verbal phrase; see break (v.) + through (adv.). The verbal phrase is attested from c. 1400 in the sense "overcome or penetrate a barrier." Meaning "abrupt solution or progress" is from 1930s, on the notion of a successful attack.

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Definitions of breakthrough

breakthrough (n.)
a productive insight;
Synonyms: discovery / find
breakthrough (n.)
making an important discovery;
breakthrough (n.)
a penetration of a barrier such as an enemy's defense;
From wordnet.princeton.edu