1. A hardware device, such as an expansion board or chip, that can be added to a computer to expand its capabilities. Also called: add-in. See also open architecture (definition 2).
2. A supplemental program that can extend the capabilities of an application program. See also utility program.

ETYM Latin amplificatio.
1. The amount of increase in signal power or voltage or current expressed as the ratio of output to input; SYN. gain.
2. Addition of extra material or illustration or clarifying detail; SYN. elaboration.
3. (Electricity) The act of increasing voltage or power or current.

ETYM Old Eng. dilatacioun, French dilatation, Latin dilatatio, from dilatare. Related to Dilate, Dilation.
1. Prolixity; diffuse discourse.
2. The act of dilating; expansion; an enlarging on all sides; the state of being dilated; dilation.
3. A dilation or enlargement of a canal or other organ.

The act of expanding an aperture; SYN. dilatation.

An improvement that makes something more agreeable; SYN. sweetening.

One that expands; specifically; any of several colloidal substances (as dextran) of high molecular weight used as a blood or plasma substitute for increasing the blood volume.

ETYM Latin expansio: cf. French expansion.
In physics, the increase in size of a constant mass of substance caused by, for example, increasing its temperature (thermal expansion) or its internal pressure. The expansivity, or coefficient of thermal expansion, of a material is its expansion (per unit volume, area, or length) per degree rise in temperature.
In mechanics, expansion refers to the increase in volume of steam in the cylinder of a steam engine after cutoff, or of gas in the cylinder of an internal-combustion engine after explosion. See also Charles's law.
1. Adding information or detail; SYN. expanding upon.
2. An interpretation that provides additional information; SYN. enlargement.
3. The act of increasing in size or volume or quantity or scope; SYN. enlargement. + prikaži više

ETYM Latin extensio: cf. French extension. Related to Extend.
1. A mutually agreed delay in the date set for the completion of a job or payment of a debt.
2. Act of expanding in scope; making more widely available.
3. Act of stretching or straightening out a flexed limb.
4. Amount or degree or range to which something extends; SYN. lengthiness, prolongation.
5. An additional telephone set that is connected to the same telephone line.
6. An educational opportunity provided by colleges and universities to people who not enrolled as regular students; SYN. extension service, university extension. + prikaži više

ETYM Latin interpolatio an alteration made here and there: cf. French interpolation.
(Mathematics) Calculation of the value of a function between the values already known.