expansion

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ex·pan·sion

(eks-pan'shŭn),
1. An increase in size as of chest or lungs.
2. The spreading out of any structure (for example, a tendon)).
3. An expanse; a wide area.
[L. ex-pando, pp. -pansus, to spread out]

expansion

/ex·pan·sion/ (ek-span´shun)
1. the process or state of being increased in extent, surface, or bulk.
2. a region or area of increased bulk or surface.

clonal expansion  an immunological response in which lymphocytes stimulated by antigen proliferate and amplify the population of relevant cells.
dorsal digital expansion , extensor expansion extensor aponeurosis; a triangular aponeurotic extension of the digital extensor tendon on the dorsum of the proximal phalanx of each digit, to which the tendons of the lumbrical and interosseous muscles are also attached, forming a movable hood around the metacarpophalangeal joint.

expansion

[ekspan′shən]
Etymology: L, expandere, to spread out
1 the process or state of being increased in extent, surface, or bulk.
2 a region or area of increased bulk or surface.

ex·pan·sion

(eks-pan'shŭn)
1. An increase in size as of chest or lungs.
2. The spreading out of any structure, as a tendon.
3. An expanse; a wide area.
[L. ex-pando, pp. -pansus, to spread out]

ex·pan·sion

(eks-pan'shŭn)
1. An increase in size as of chest or lungs.
2. Spreading out of any structure (e.g., a tendon).
[L. ex-pando, pp. -pansus, to spread out]

expansion,

n an increase in extent, size, volume, or scope.
expansion, delayed (secondary expansion),
n 1. an expansion occurring in amalgam restorations as a result of moisture contamination.
n 2. an expansion exhibited by amalgam that has been contaminated by moisture during trituration or insertion.
expansion, dental arch,
n the therapeutic increase in circumference of the dental arch by buccal or labial movement of the teeth.
expansion, hygroscopic,
n an expansion, caused by absorption of water during setting of an investment, used to compensate for the shrinkage of metal from the molten to the solid state.
expansion, secondary,
n See expansion, delayed.
expansion, setting,
n an expansion that occurs during the setting or hardening of materials such as amalgam and gypsum products.
expansion, thermal,
n an expansion caused by heat. Thermal expansion of the mold is one of the important factors in achieving adequate compensation for the contraction of cast metal when it solidifies.
expansion, thermal coefficient,
n a number indicating the amount of expansion caused by each degree of temperature change. The rate of change in restorative materials and tooth substance should be relatively the same.
References in classic literature ?
The former cast one admiring glance from north to south, and sank his face again beneath the folds of his coat; while the latter contemplated, with philanthropic pleasure, the prospect of affluence and comfort that was expanding around him; the result of his own enterprise, and much of it the fruits of his own industry.
This ballast being discarded, and a clear sunshine evaporating the dew, and at the same time expanding the gas in the silk, the whole will again rapidly ascend.
It came upon him nearer now, quite as one of those expanding fantastic images projected by the magic lantern of childhood; for the stranger, whoever he might be, evil, odious, blatant, vulgar, had advanced as for aggression, and he knew himself give ground.
Several times some masses of enormous bulk were forced up through the well-hole with inconceivable violence, and, suddenly expanding as they came into larger space, disclosed sections of the White Worm which Adam and Sir Nathaniel had seen looking over the trees with its enormous eyes of emerald- green flickering like great lamps in a gale.
Well, think of wretches of our flesh and blood growing up under a taunt which they will gradually get to feel the full force of with their expanding years.
The tender shoots and the expanding flowers are nipped and withered, and of a vine that yearned to stretch its tendrils round the world there is left but a sapless stump.
It was in the early morning stillness, when his muscles were swinging to their familiar task and his lungs expanding with long draughts of mountain air, that Ethan did his clearest thinking.
Sigsbee's benevolence was expanding under the influence of the Scotch highball and his cigar.
Rouncewell, expanding her stomacher to its utmost limits, "than it formerly was
The appearance of this part of Africa was, moreover, quite calculated to inspire alarm: the desert was gradually expanding around them; not another village was to be seen--not even a collection of a few huts; and vegetation also was disappearing.