основной

1) General subject: basal, base, basic, basilar, best, biggest (our biggest competitor - наш основной конкурент), bottom, broad, capital, cardinal, central (central idea - основная идея), chief, constitutive, core, down, elemental, elementary, essential, first string, foremost, foundational, fundamental, general, key, main, major, master, meat and potatoes, number one, original, overriding, parent, pivotal, primary, prime, primitive (о цвете и т. п.), principal, quintessential, radical, root, staminal, staple (о продуктах потребления или предметах торговли), ultimate, underlying, dominant, standard, bedrock, stock

2) Geology: subsilicic

3) Aviation: mainstream

4) Medicine: leading

5) Colloquial: meat-and-potatoes

6) Engineering: generic, in-line

7) Chemistry: basic-type, core basal

8) Mathematics: driving (о члене), ground, predominant, primal

9) Railway term: underlaying

10) Law: gist (обвинения, договора и т.п.), institutional, jet, organic, substantive

11) Accounting: fixed

12) Architecture: primordial

13) Mining: mains

14) Diplomatic term: governing, grand, main problem, main question

15) Psychology: absolute, real

16) Jargon: gut, gutty, funky, nuts and bolts

17) Information technology: backbone, basis, core journal, mainframe, pivot

18) Oil: main stream, salient

19) Astronautics: baselined

20) Metrology: elementary (например, о цвете)

21) Advertising: body, bsc.

22) Taxes: principal (contract) (договор)

23) Business: substantial, important

24) Drilling: reference

25) Network technologies: host

26) Automation: kernel, wireframe

27) Aviation medicine: baseline

28) Makarov: alpha, backing, continental (о части государства без островов и полуостровов), critical, dominant (напр. носитель тока), dominant (напр., носитель тока), first-string (о составе актёрской труппы, футбольной команды и т.п.), keynote, mother, organic (амер.,юр), pacing, schematic, skeleton