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Possible definitions for vacation

aviation
Development and operation of heavier-than-air aircraft. In 1783 the balloon became the first aircraft to carry humans. Production of a successful glider in 1891 and refinement of the internal combustion engine led to the first successful engine-powered airplane flight by W. and O. Wright in 1903. World War I accelerated the expansion of aviation, and in the 1920s the first small airlines began carrying mail and passengers. World War II was another period of innovation in aircraft size, speed, and range. In the late 1940s the jet engine made possible the subsequent development of commercial airlines throughout the world. See also airship, helicopter, seaplane.


cation
Atom or group of atoms carrying a positive electric charge, indicated by a superscript plus sign after the chemical symbol. Cations in a liquid subjected to an electric field collect at the negative pole (cathode). Examples include sodium (Na+), calcium (Ca2+), and ammonium (NH4+; see ammonia). See also ion.

Top words beginning with V: vocalist, viscountess, vultern, vollies, verdoglobin, vitaceae, vaginismus, vitraux, villainesses, varikozele, vocalise, vicariateship, vacuation, vulsella, vegetably, ventriculitic, vasopressin, vetturino, valentine, vacuolated

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