breakthrough

1 ENTRIES FOUND:
breakthrough /ˈbreɪkˌθruː/ noun
plural throughs
breakthrough
/ˈbreɪkˌθruː/
noun
plural throughs
Britannica Dictionary definition of BREAKTHROUGH
[count]
1 
: a sudden increase in knowledge, understanding, etc. : an important discovery that happens after trying for a long time to understand or explain something
— sometimes used before another noun
2 
: a person's first important success
— sometimes used before another noun — see also break through at 1break