дополнительный

1) General subject: accessorial, accessory, add-on, additional, additory, adjunct, adjunctive, adminicular, adscititious, alternate, amplificatory, another, appendant, auxiliary, by, collateral, complementary, contingent, excess, expletive, extra, farther, follow-up, further, in addition, more, new, obverse, occasional, other, plus, second, spare, subsidiary, supererogatory, supernumerary, supplemental, supplementary, attached, (train, plain) back-up

2) Naval: excessive, gash

3) Medicine: ancillary, assident, succenturiate, subs (subsidiary)

4) Colloquial: wildcat (о поезде)

5) Obsolete: accessive (Source: Webster's Revised Unabridged Dictionary (1913))

6) Military: off-line, applique

7) Engineering: added, option, pony, powney, pownie, powny

8) Bookish: appendical, epactal

9) Chemistry: padding

10) Mathematics: adjugate, complement

11) Railway term: superposed

12) Law: accessary, adjective, collateral, secondary, subsequent

13) Linguistics: completive

14) Diplomatic term: special (о выборах и т.п.), supporting

15) Polygraphy: run-on, run-on (о печатном. материале)

16) Telecommunications: ext

17) Jargon: buckshee, side-bar

18) Information technology: add-in, backing, companion, optional, tentative

19) Oil: complemental

20) Special term: addititious

21) Metrology: complimentary

22) Business: collateral (об обеспечении и т.п.), incremental, marginal, ministerial, side-line

23) Network technologies: piggyback

24) Programming: extension, attaching, advanced

25) Quality control: accidental, false

26) Makarov: adventitious, adventive, annex, branch, external, indirect, odd, peripheral, tributary

27) SAP.tech. addnl

28) General subject: antithetic