"dual" synonyms, related words, and opposites

Similar:

multiple, plural, twofold, duple, double, threefold, treble, triple, multi, twin, more...

Opposite:

singular, unified, individual, sole, single

Types:

dative, locative, ablative, genitive, more...

Meter:

Adjectives:

primal, non, self, own, indivi, exact, from, corresponding, lagrangian, topological, directional

Colors:

black, white, red, blue, yellow, green, orange, purple, pink, brown

Crossword clues:

two sides, two things, single or double, two things at once, two in one, inside and outside, having two parts, two positions, for both, 2 in 1