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Definitions (92)
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age of exploration
[noun] (15th-early 17th century) also referred to as the Age of Discovery, this was a time in history during which Europeans explored and mapped the world, establishing primary contacts with Africa, the Americas, Asia and Oceania. In particular, Portuguese and Spanish explorers made ocean voyages in search of alternative trade routes to the Indies, [..]
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amphiphilic
[adjective] (from the Greek amphi, "both," and philic, "loves," so together it means "loves both") Molecules that are both water-soluble (hydrophilic) and oil-soluble (lipophilic). Appears in modules:
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atmosphere
[noun] The collective mass of gases that surrounds the Earth or another planet. Appears in modules:
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help
Contact Us
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aaas
[acronym] American Association for the Advancement of Science, pronounced "Triple-A ess." Appears in modules:
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abiogenesis
[noun] The emergence of life forms emerging from non-living chemical systems. In contrast with spontaneous generation, abiogenesis is not a process that biologists think continues in a particular environment, such as a planet or moon, once a living system has emerged. Appears in modules:
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absolute temperature
[noun] A temperature scale with its units in Kelvin. A temperature in degrees Celsius can be converted to Kelvin by adding 273.15 to its value.
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absolute zero
[noun] The theoretical lowest temperature possible at which all molecular motion ceases. Absolute zero, 0 K or -273.15°C, has never been reached. Appears in modules:
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abstract
[noun] In science, an abstract is a brief statement of essential information contained within a document or presentation. An abstract is not an introduction, rather it concentrates the most pertinent information to facilitate understanding of the main points of the document. Most scientific journal articles include an abstract at the beginning of t [..]
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acceleration
[noun] The change in an object's velocity over time, measured in distance per unit time per unit time (for example meters per second per second or m/s2). Compare to velocity. Acceleration (a) is calculated by dividing the change (symbolized by Δ, the Greek letter delta) in velocity (v) by the change in time (t): a = Δv/ Δt. This can also be wr [..]
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