A dual is a pair or a grouping of two. "Dual" is also the name for many things: Wikipedia does not have an article with this exact name. ... Wiktionary logo Wiktionary is a sister project to Wikipedia intended to be a free wiki dictionary (including thesaurus and lexicon) in every language. ...
Dual is a brand name for Hifi equipment, mostly known for vinyl record players.
In some languages, in addition to the singular and plural numbers there is also a dual number, which is used when exactly two people or things are meant.
A simultaneous application of a P-type and N-type fertilizer
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Dualism is also used in a special theological sense to describe a doctrine of the Nestorian heresy.
This blind dualism found its natural consequence in the revolt of the Renaissance thinkers, Bruno and Paracelsus, who asserted the unity of mind and matter in all existence and were the precursors of the more intelligent monism of Leibnitz and the scientific metaphysics of his successors.
It follows that philosophy is in a sense both dualist and monist; it is a cosmic dualism inasmuch as it admits the possible existence of matter as a hypothesis, though it denies the possibility of any true knowledge of it, and is hence in regard of the only possible knowledge an idealistic monism.