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centimeter
centimeter , abbr. cm, unit of length equal to 0.01 meter , the basic unit of length in the metric system . The centimeter is the unit of length in the cgs system . It is approximately equal to 0.39 inch, or 1 inch equals about 2.54 centimeters. See weights and measures .
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chord
chord , in geometry, straight line segment both end points of which lie on the circumference of a circle or other curve; it is a segment of a secant . A chord passing through the center of a circle is a diameter. In the same circle or in equal circles, equal chords subtend equal arcs and equal cent...
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hectare
hectare , abbr. ha, unit of area in the metric system , equal to 10,000 sq m, or about 2.47 acres.
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gram
gram abbr. g, unit of mass equal to 0.001 kilogram , the basic unit of mass in the metric system . The gram is the unit of mass in the cgs system . It is approximately equal to 0.035 avoirdupois ounce, or 0.0022 pound; a 1-pound mass equals about 453.6 grams.
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liter
liter abbr. l, unit of volume in the metric system , defined since 1964 as equal to 0.001 cubic meters, or 1 cubic decimeter. A cube that has each of its edges equal to 10 centimeters has a volume of 1 liter. The liter is equal to 1.057 liquid quarts, 0.908 dry quarts, and 61.024 cubic inches.
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trapezoid
trapezoid closed plane figure bounded by four line segments, or sides, two of which are parallel and two of which are nonparallel. The parallel sides of a trapezoid are called bases and the nonparallel sides legs; in an isosceles trapezoid the legs are of equal length. The median of a trapezoid is ...
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Nethinim
Nethinim , in the Bible, alien captives of the Jews who performed the humblest tasks of the temple. Their lot improved until in post-Exilic times they became the equals of other temple officials.
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Open Door
Open Door maintenance in a certain territory of equal commercial and industrial rights for the nationals of all countries. As a specific policy, it was first advanced by the United States, but it was rooted in the typical most-favored-nation clause of the treaties concluded with China after the ...
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hour angle
hour angle in astronomy, a coordinate in the equatorial coordinate system . The hour angle of a celestial body is the angular distance, expressed in hours, minutes, and seconds (one hour equals 15 degrees), measured westward along the celestial equator from the observer's celestial meridian to the...
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parallelogram
parallelogram closed plane figure bounded by four line segments, or sides, with opposite pairs of sides parallel and equal in length. The rhombus, rectangle, and square are special types of parallelograms. Any side of a parallelogram is a base; an altitude is the perpendicular distance from a base ...
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