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(gäp), city (1990 pop. 35,647), capital of Hautes-Alpes dept., SE France, on the Luye River at the foot of the Dauphiné Alps. A center for tourism, Gap is an agricultural market that manufactures clothing, wood products, and construction materials. Founded by Augustus c.14 B.C., it was the capital of medieval Gapençais, which was annexed to the crown of France in 1512. The city was devastated during the Wars of Religion (16th cent.).


A region not adequately covered by the main lobes of a radar antenna.
(computer science)
A uniformly magnetized area in a magnetic storage device (tape, disk), used to indicate the end of an area containing information.
The spacing between two electric contacts.
A break in a closed magnetic circuit, containing only air or filled with a nonmagnetic material.
A short region that is missing in one strand of a double-stranded deoxyribonucleic acid.
Any sharp, deep notch in a mountain ridge or between hills.
An opening at the point of closest approach between faces of members in a weld joint.


An opening, as in a wall; an open joint.


i. Any space where the imagery fails to meet the minimum coverage requirements. This might be a space not covered by imagery or one where the minimum specified overlap was not obtained.
ii. Breaks in continuous radar coverage. See gap-filler radar.


1. a break in a line of hills or mountains affording a route through
2. Chiefly US a gorge or ravine
3. Electronics
a. a break in a magnetic circuit that increases the inductance and saturation point of the circuit
b. See spark gap


(mathematics, tool)
Groups Algorithms and Programming.

A system for symbolic mathematics for computational discrete algebra, especially group theory, by Johannes Meier, Alice Niemeyer, Werner Nickel, and Martin Schonert of Aachen. GAP was designed in 1986 and implemented 1987. Version 2.4 was released in 1988 and version 3.1 in 1992.

Sun version.

["GAP 3.3 Manual, M. Schonert et al, Lehrstuhl D Math, RWTH Aachen, 1993].


(1) The space between blocks of data on magnetic tape.

(2) The space in a read/write head over which magnetic flux (energy) flows causing the underlying magnetic tape or disk surface to become magnetized in the corresponding direction.
References in periodicals archive ?
6) In such cases, the urine osmolal gap, defined as urine osmolality - (2[Na+ + K+] + [urea] + [glucose]) should be used, since the gap mainly reflects the excretion of N[H.
After hemodialysis was performed, the patient's postdialysis serum showed an osmolal gap of 6 mOsm/kg and an EG concentration of 50 mg/dL (8.
The diagnosis of EG toxicity is made via a combination of the patient's history, the clinical picture, and a laboratory analysis showing an anion gap metabolic acidosis with an increased osmolal gap.
Patients with AKA will present with an increased anion gap in combination with an increased osmolal gap.
Serum osmolal gap and ethanol concentration: a simple and accurate formula.
6 Acetaminophen, [micro]mol/L 1218 <66 78 EtOH, mmol/L Advia 1650 33 33 34 RXL MAX <2 <2 <2 Gas chromatograph <2 <2 <2 Measured osmolality, mmol/kg 306 286 278 Osmolal gap Calculated using EtOH from Advia 1650 -23 -42 -44 Calculated using EtOH from gas chromatograph 18 -1 -1 (a) Acetaminophen concentrations were measured at approximately 24, 96, and 48 h after ingestion for patients 1, 2, and 3, respectively.
As it happened, we were alerted to a potential problem by the unusually large negative osmolal gaps in all 3 patients.
Laboratory values on admission are given in Table 1 and include a metabolic acidosis with increased anion gap and an increased osmolal gap.