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второстепенное n stresses
gen.	underpart
Gruzovik	collateral
psychol.	what's merely a detail (understand what's critically important and what's merely a detail – уметь отделять главное от второстепенного Alex_Odeychuk)
второстепенное adj.
gen.	bye (сущ. Gruzovik)
второстепенный adj.
gen.	secondary; minor; accidental; accessory; collateral; peripheral; second; subsidiary; tributary (о породе); off; back-burner; satellitic; accessary; supporting (персонаж – character q3mi4); afterthought (напр., to view as an afterthought – считать второстепенным eredin); second-tier (marastork); back burner; lateral; middling; second-class; fringe (Дмитрий_Р); supportive (ssn); lesser (контекстуально Pickman); by-; b; less; conventional (VLZ_58); subordinate (Find the originators of this signal and bring them back ... , all other costs and consideration.); ancillary (о работниках или ресурсах, которые заняты в обеспечении каких-либо вспомогательных функций по отношению к основному производству; также о фирмах или отраслях, которые производят вспомогательные продукты для каких-то других продуктов kee46); penultimate (eugenealper); second rate
Игорь Миг	marginal; non-mainstream; parochial
account.	incidental
astronaut.	auxiliary
biol.	minor (напр., о признаке)
busin.	non prevalent (Johnny Bravo)
cinema	Recurring (о роли lavagirl)
dipl.	non-essential; second-hand
dril.	satellite; sec. (secondary)
econ.	second-rate
el.	tributary; s; sec
fig.	one-star (one-star tourist attraction Pickman)
fin.	associated
forestr.	codominant
geol.	affluent
Gruzovik, IT	low-priority
inf.	petty (That makes me petty. chronik)
IT	aux
Makarov.	utility (о персонаже романа и т.п.); weak (об ударении); codominant (о древесной породе)
math.	of minor importance; unimportant
met.	nonessential
mil., tech.	alternate
mining.	end; cross
psychol.	consequential
seism.	pony
slang	small-time
tech.	supplementary
textile	counter
второстепенно adv.
gen.	secondly (ssn; наречие Gruzovik)
obs.	accessarily; accessorily
oil	secondarily
psychol.	collaterally (наречие Gruzovik)
второстепенная adj.
gen.	by-way (сущ. Gruzovik)
о патологическом процессе, состоянии: второстепенный adj.
med.	Bystander (Nidarat)

второстепенное: 738 phrases in 101 subjects

Accounting	7
Advertising	19
Agriculture	4
Agrochemistry	3
American usage, not spelling	6
Architecture	14
Armored vehicles	2
Astronautics	1
Automated equipment	3
Automobiles	10
Aviation	11
Aviation medicine	6
Banking	5
Biology	4
Biotechnology	1
Building structures	1
Business	19
Cartography	1
Caspian	1
Chess	3
Chromatography	1
Cinematography	11
Clinical trial	3
Clothing	2
Combustion gas turbines	1
Commerce	1
Construction	21
Diplomacy	12
Ecology	5
Economy	25
Education	3
Electronics	4
Energy industry	2
European Bank for Reconstruction and Development	2
Figurative	5
Firefighting and fire-control systems	1
Foreign policy	1
Forestry	6
Gas processing plants	2
General	123
Geology	41
Geophysics	6
Gold mining	1
Grammar	1
Hydrology	1
Immunology	1
Informal	4
Information technology	2
International Monetary Fund	1
Investment	2
Latin	1
Law	13
Librarianship	4
Linguistics	7
Logistics	5
Makarov	47
Mass media	13
Mathematics	9
Mechanic engineering	4
Medical	6
Metallurgy	2
Meteorology	1
Metrology	1
Military	49
Mining	12
Nautical	8
Navigation	2
Oceanography & oceanology	2
Oil / petroleum	14
Oil and gas	5
Ornithology	1
Patents	7
Pharmacology	1
Politics	8
Polygraphy	1
Procurement	2
Professional jargon	1
Programming	13
Psychology	3
Pulp and paper industry	1
Quotes and aphorisms	1
Rail transport	6
Road construction	1
Road works	13
Sakhalin	5
Sakhalin A	1
Sakhalin R	1
SAP	1
Scientific	1
Security systems	1
Seismology	3
Shipbuilding	3
Sociology	1
Software	2
Stock Exchange	2
Technology	26
Theatre	3
Transport	4
United States	1
Vulgar	1
Wood processing	6