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Possible definitions for oas
base
In chemistry, any substance that in water solution is slippery to the touch, tastes bitter, changes the color of acid-base indicators (e.g., litmus paper), reacts with acids to form salts, and promotes certain chemical reactions (e.g., base catalysis). Examples of bases are the hydroxides of the alkali metals and alkaline earth metals (sodium, calcium, etc.) and the water solutions of ammonia or its derivatives (amines). Such substances produce hydroxide ions (OH-) in water solutions. Broader definitions of bases cover situations in which water is not present. See also acid-base theory, alkali, nucleophile.
bass
Lowest musical voice or register. In vocal music, its range is approximately from the second E below middle C to middle C itself. A basso profundo emphasizes a lower register, a basso cantante a somewhat higher one. Outside of Russia, the solo bass voice has generally been relegated to certain standard operatic character roles. The lowest-pitched member of most instrumental families is usually called the bass (bass clarinet, double bass, etc.). In Western tonal music, the bass part is usually second in importance only to the melody, being the chief determiner of harmonic movement, a tendency that became particularly notable after the appearance of the basso continuo c.1600.
In zoology, any of numerous fish species, many valued for food or sport. Most are placed in three families (all in the order Perciformes): 400 species of sea bass and grouper; the family Moronidae, which contains about 12 species, incl. striped and European basses; and sunfishes, incl. the black and largemouth basses, prized by fishermen. Many other species are also known as bass, incl. the channel bass (a drum) and the calico bass (a crappie).
CASE
Use of computers in designing sophisticated tools to aid the software engineer and to automate the software development process as much as possible. It is particularly useful where major software products are designed by teams of engineers who may not share the same physical space. CASE tools can be used for simple operations such as routine coding from an appropriately detailed design in a specific programming language, or for more complex tasks such as incorporating an expert system to enforce design rules and eliminate software defects and redundancies before the coding phase.
gas
One of the three fundamental states of matter, in which matter has no definite shape, is very fluid, and has a density about 0.1% that of liquids. Gas is very compressible but tends to expand indefinitely, and fills any container. A small change in temperature or pressure produces a substantial change in its volume; these relationships are expressed as equations in the gas laws. The kinetic theory of gases, developed in the 19th cent., described gases as assemblages of tiny particles (atoms or molecules) in constant motion and contributed much to our understanding ...
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