duality
(noun) (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
duality, wave-particle duality
(noun) (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
dichotomy, duality
(noun) being twofold; a classification into two opposed parts or subclasses; “the dichotomy between eastern and western culture”
Source: WordNet® 3.1
duality (countable and uncountable, plural dualities)
A classification into two subclasses or opposed parts.
(projective geometry) The interchangeability of points and planes.
(mathematics, physics) The mathematical equivalence of two seemingly different theoretical descriptions of a physical system.
• dichotomy
Source: Wiktionary
Du"al"i*ty, n. Etym: [L. dualitas: cf. F. dualité.]
Definition: The quality or condition of being two or twofold; dual character or usage.
Source: Webster’s Unabridged Dictionary 1913 Edition
13 June 2025
(noun) an aircraft that has a fixed wing and is powered by propellers or jets; “the flight was delayed due to trouble with the airplane”
According to Guinness World Records, the largest coffee press is 230 cm (7 ft 6 in) in height and 72 cm (2 ft 4 in) in diameter and was created by Salzillo Tea and Coffee (Spain) in Murcia, Spain, in February 2007. The cafetière consists of a stainless steel container, a filtering piston, and a superior lid.
