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  • English Word Apsis Definition One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides.
  • English Word Apsis Definition In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum.
  • English Word Apsis Definition Same as Apse.
  • English Word Apt Definition Fit or fitted; suited; suitable; appropriate.
  • English Word Apt Definition Having an habitual tendency; habitually liable or likely; -- used of things.
  • English Word Apt Definition Inclined; disposed customarily; given; ready; -- used of persons.
  • English Word Apt Definition Ready; especially fitted or qualified (to do something); quick to learn; prompt; expert; as, a pupil apt to learn; an apt scholar.
  • English Word Apt Definition To fit; to suit; to adapt.
  • English Word Aptable Definition Capable of being adapted.
  • English Word Aptate Definition To make fit.
  • English Word Aptera Definition Insects without wings, constituting the seventh Linnaen order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders.
  • English Word Apteral Definition Apterous.
  • English Word Apteral Definition Without lateral columns; -- applied to buildings which have no series of columns along their sides, but are either prostyle or amphiprostyle, and opposed to peripteral.
  • English Word Apteran Definition One of the Aptera.
  • English Word Apteria Definition Naked spaces between the feathered areas of birds. See Pteryliae.
  • English Word Apterous Definition Destitute of wings; apteral; as, apterous insects.
  • English Word Apterous Definition Destitute of winglike membranous expansions, as a stem or petiole; -- opposed to alate.
  • English Word Apteryges Definition An order of birds, including the genus Apteryx.
  • English Word Apteryx Definition A genus of New Zealand birds about the size of a hen, with only short rudiments of wings, armed with a claw and without a tail; the kiwi. It is allied to the gigantic extinct moas of the same country. Five species are known.
  • English Word Aptitude Definition A natural or acquired disposition or capacity for a particular purpose, or tendency to a particular action or effect; as, oil has an aptitude to burn.
  • English Word Aptitude Definition A general fitness or suitableness; adaptation.
  • English Word Aptitude Definition Readiness in learning; docility; aptness.
  • English Word Aptitudinal Definition Suitable; fit.
  • English Word Aptly Definition In an apt or suitable manner; fitly; properly; pertinently; appropriately; readily.
  • English Word Aptness Definition Fitness; suitableness; appropriateness; as, the aptness of things to their end.
  • English Word Aptness Definition Disposition of the mind; propensity; as, the aptness of men to follow example.
  • English Word Aptness Definition Quickness of apprehension; readiness in learning; docility; as, an aptness to learn is more observable in some children than in others.
  • English Word Aptness Definition Proneness; tendency; as, the aptness of iron to rust.
  • English Word Aptote Definition A noun which has no distinction of cases; an indeclinable noun.
  • English Word Aptotic Definition Pertaining to, or characterized by, aptotes; uninflected; as, aptotic languages.