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задолго adv.stresses
gen. long before; with plenty of time to spare (Olga Fomicheva)
Gruzovik long in advance
idiom. from the dawn of time (до какого-либо события hamsy)
Makarov. well in advance; advance
задолго: 32 phrases in 9 subjects
American usage, not spelling1
General12
Informal2
Makarov5
Mathematics8
Scientific1
Seismology1
Slang1
Telecommunications1