двойственный

• IPA^(key): [ˈdvojstvʲɪn(ː)ɨj]

дво́йственный • (dvójstvennyj)

1. dual; double; twofold (consisting of two parts, or a pair of something)

   дво́йственный многогра́нник ― dvójstvennyj mnogogránnik ― dual polyhedron

2. double; dual; biune (exhibiting duality; manifesting in two forms or ways)
3. bipartite (having two parties)

   дво́йственное соглаше́ние ― dvójstvennoje soglašénije ― bipartite agreement

4. (grammar) dual (pertaining to a grammatical number in certain languages that refers to two of something)

   дво́йственное число́ ― dvójstvennoje čisló ― dual number

5. (figurative) two-faced, double-faced; duplicitous (marked by deliberate deceptiveness)

   дво́йственная поли́тика ― dvójstvennaja polítika ― two-faced policy

6. (figurative) ambivalent; ambiguous (expressing two contradictory feelings, beliefs, motivations, or meanings)

• два (dva)
• двойно́й (dvojnój)
• двоя́кий (dvojákij)
• двои́чный (dvoíčnyj)