The acute angle between the horizontal and a given line (see inclination) measured positively in the direction of the downwards vertical. θ is the angle of depression of the boat from the top of the cliff. Sometimes also known as the angle of declination.
1. Enclosed area of low pressure revealed by the pattern of pressure distribution. Depressions are also described as cyclones, or cyclonic systems, and have a characteristic pattern of wind circulation (anticlockwise around low pressure areas in the northern hemisphere). Mid-latitude depressions are associated with the convergence of polar and tropical air masses along a frontal zone: this commonly becomes deformed, and each air mass in turn advances over parts near (especially south of) the depression path, bringing first a warm and then a cold front.
2. The downward convexing of a crest line in a non-cylindroidal fold.
An area of low pressure (roughly, below 1 000 mb); see mid-latitude depression. Depression tracks are influenced by the courses of jet streams, energy sources—such as warm seas—and mountain barriers.
A prolonged period of abnormally low economic activity and abnormally high unemployment. This is often accompanied by a tendency for prices to fall, or at least to rise more slowly than usual, and by a fall in the relative prices of primary products as compared with those of industrial products. See also recession.
- Redstone rocket
- red tide
- reduce
- reduced echelon form
- reduced form
- reduced instruction set computer
- reduced pressure
- reduced proper motion
- reduced set of residues
- reduced temperature
- reducibility, axiom of
- reducible polynomial
- reducing agent
- reducing balance depreciation
- reducing sugar
- reduct
- reductant
- reductio ad absurdum
- reductio ad contradictionem
- reductio ad falsum
- reductio ad impossibile
- reduction
- reduction division
- reduction formula
- reductionism