gear (particular combination or choice of interlocking gears, as in reverse gear) · switch, (set of) points (movable rails used to switch a train from one track to another) · switch (system allowing the interconnection of lines, especially telephone)
extension: · the state of being extended · capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension
çekim: çoğul ekstensi-ekstensi
köken: Borrowed from Dutch extensie (“extension”), from French extension, from Late Latin extensio.