Dual
Part of speech: adjective
Definition: Characterized by having two (usually equivalent) components. Double. Pertaining to grammatical number (as in singular and plural), referring to two of something, such as a pair of shoes, in the context of the singular, plural and in some languages, trial grammatical number. Modern Arabic displays a dual number, as did Homeric Greek.
Part of speech: noun
Definition: Of an item that is one of a pair, the other item in the pair. Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces. dual number The grammatical number of a noun marking two of something (as in singular, dual, plural), sometimes referring to two of anything (a couple of, exactly two of), or a chirality-marked pair (as in left and right, as with gloves or shoes) or in some languages as a discourse marker, "between you and me". A few languages display trial number. Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.
Example sentence: I was born in Jamaica but was educated by, and now serve, prestigious First World institutions, so I believe that I have a unique, dual perspective. To sidestep any biases I might have, I use the objective lens of the stock market to discover which policies actually delivered prosperity to emerging markets.
Plural
Part of speech: noun
Definition: a word in the form in which it potentially refers to something other than one person or thing; and other than two things if the language has a dual form.
Part of speech: adjective
Definition: More than one of something.