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с тех пор stresses
gen.	since when (In the county court it was formerly done by the bailiff on behalf of the court until this was stopped in 1983 as an economy measure, since when it was usually sent by the court through the post. Alexander Demidov); since (I have since moved to a cheap soldering station which provides real time temperature readings, however this is still what I use when I'm away from my station.); from then onwards; from then onward (Anglophile); from then on (george serebryakov); ever since (как); ever after; ever since; ever after (и до конца); after; from then (Stas-Soleil); thereafter; from that day forth; sen; sin; sith; sithes; from thence
Gruzovik	henceforward
book.	from thenceforth; thenceforth
busin.	since the early days (Johnny Bravo)
inf.	from that time on (Ремедиос_П)
Makarov.	ever since (все время)
math.	since then, several generations of computing equipment have been developed, each being significantly better than the one before it
obs.	sith (an archaic word for since Interex); sithence
oil	thence
proverb	since then
relig.	from that moment on; since that time; thenceforward
scottish	sinsyne; syne
с той поры
gen.	from then on (She had a car accident a year ago and suffered from back pain from then on. george serebryakov); from then onwards (From then onwards, everything between them changed. george serebryakov); from then onward (Anglophile); since then; ever since (Anglophile); from then (Stas-Soleil)

с тех пор: 144 phrases in 14 subjects

American usage, not spelling	3
Aviation	1
Chess	1
General	76
Historical	1
Idiomatic	2
Informal	6
Literature	4
Makarov	40
Mathematics	2
Patents	1
Programming	1
Proverb	5
Sports	1