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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.).
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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


An opening, as in a wall; an open joint.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved


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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(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].
This article is provided by FOLDOC - Free Online Dictionary of Computing (


(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.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Analysis of mean air-bone gap values by perforation size for all four groups showed the highest mean values at 500 Hz.
We showed a statistically significant improvement in the mean postoperative hearing level, from 43.1 [+ or -] 17.3 dBHL preoperatively to 39.2 [+ or -] 18.2 dBHL postoperatively, but not in the mean postoperative air-bone gap, which declined from 19.4 [+ or -] 7.6 dB preoperatively to 16.9 [+ or -] 9.9 dB postoperatively.
Results indicates that significant changes occurred in both the hearing levels and air-bone gaps in both timing and frequency after the active treatment period.
Pre-OP AB GAP Number of Cases 25-35 dB 26 36-45 dB 14 Postoperative Air-Bone GAP
Stapedoplasty in patients with small air-bone gap: Why not?
Averages of air-conduction thresholds and average air-bone gaps at 0.5, 1, 2 and 4 kHz detected in the last follow-up were used to evaluate the postoperative hearing.
A series of 465 cases reported closure of air-bone gap to [less than or equal to] 15 dB in 63% of cases and to [less than or equal to]20 dB in 73% of cases with partial ossicular replacement prostheses (PORP) [7].
On the other hand, in patients with stapedectomy, only 16 patients (64%) developed complete closure of the air-bone gap (<10 dB) on pure tune audiometry; while in four patients (16%), the airbone gap improved to less 20 dB, recurrent conductive hearing loss in three patient (12%), one patient developed complete sensorineural hearing loss (4%), and one case of fluctuating hearing loss due to reparative granuloma (4%) was reported.
Pure tone audiometry was performed and air conduction threshold and air-bone gap were noted.
Preoperative and postoperative pure-tone average (PTA) and air-bone gap (ABG) were assessed and compared 1 and 5 years after surgery.
The air-bone gap was calculated at 500, 1000, 2000, and 4000 Hz in decibel (dB).
Moreover, an air-bone gap of 10 dB or greater was found in 80% (8/10) of patients by PTA.