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навечный adj. stresses
Gruzovik, obs.	eternal; everlasting
навечно adv.
gen.	forever; for good; for perpetuity; to perpetuity; for ever and a day; always; to the end of time (Anglophile); for ever; in perpetuity; ever so long (КГА); indelibly (markvidov); in perpetuum (merriam-webster.com Abysslooker); for all time
Makarov.	perpetuity
relig.	for ever and ever

навечно: 16 phrases in 6 subjects

American usage, not spelling	1
General	10
Idiomatic	1
Makarov	2
Mass media	1
Military	1