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1. Multiplied by four; quadruple.
2. Fourth in a group of four identical things.
One of a group of four identical things.
tr. & intr.v. (-kāt′) quad·ru·pli·cat·ed, quad·ru·pli·cat·ing, quad·ru·pli·cates
To multiply or be multiplied four times.

[Latin quadruplicātus, past participle of quadruplicāre, to multiply by four, from quadruplex, fourfold : quadru-, quadri-, quadri- + -plex, -fold; see duplex.]

quad·ru′pli·cate·ly (-kĭt-lē) adv.
quad·ru′pli·ca′tion n.
References in classic literature ?
The double track turned sharp off and took the direction of King's Pyland.
A double track of wires is made to carry three talk-trains running abreast, a feat made possible by the whimsical disposition of electricity, and which is utterly inconceivable in railroading.
There were double tracks, and wonderful they were, such as one might marvel at, the doing of a clever sprite; for as for the cows, the dark dust kept and showed their footprints leading towards the flowery meadow; but he himself -- bewildering creature -- crossed the sandy ground outside the path, not on his feet nor yet on his hands; but, furnished with some other means he trudged his way -- wonder of wonders
The Land Bridge announces expansion from Jeddah to Riyadh with a total length of around 1,000 km of double track.
The Land Bridge extends from Jeddah to Riyadh with a total length of approximately 1,000 km of double track.
Indeed, such is progress that our terrific transport personnel are now turning the UK's most important, unused but easily reinstated, double track intercity line into use by two different kinds of slow trams.
The speeding bus was heading towards Kot Lakhpat Jail for carrying prisoners to court when it went out of control of the driver, broke the divider of the double track road and crashed into the foot path on the other side of the road.
Answering another question, he said that double track on Karachi-Peshawar mainline existed only on Karachi -Lodhran (843 Km) and Raiwind-Lahore Sections (47 Km) at the time of independence.
Addressing the inaugural ceremony of double track of railways from Lodhran to Raiwind here at Prem Nagar, he said that those who were making efforts to make this project controversial were not serving the nation.
I refer to the existing Coryton/ Cardiff/Radyr Route, which is double track width, if not double track for all of its length at present.
NORDIC BUSINESS REPORT-November 20, 2014-Peab awarded SEK229m contract to build a double track railway line along Nynasbanan
M2 EQUITYBITES-November 20, 2014-Peab awarded SEK229m contract to build a double track railway line along Nynasbanan