in·ter·cept

[v. in-ter-sept; n. in-ter-sept]
verb (used with object)
1.
to take, seize, or halt (someone or something on the way from one place to another); cut off from an intended destination: to intercept a messenger.
2.
to see or overhear (a message, transmission, etc., meant for another): We intercepted the enemy's battle plan.
3.
to stop or check (passage, travel, etc.): to intercept the traitor's escape.
4.
Sports. to take possession of (a ball or puck) during an attempted pass by an opposing team.
5.
to stop or interrupt the course, progress, or transmission of.
6.
to destroy or disperse (enemy aircraft or a missile or missiles) in the air on the way to a target.
7.
to stop the natural course of (light, water, etc.).
8.
Mathematics. to mark off or include, as between two points or lines.
9.
to intersect.
10.
Obsolete. to prevent or cut off the operation or effect of.
11.
Obsolete. to cut off from access, sight, etc.
noun
12.
an interception.
13.
Mathematics.
a.
an intercepted segment of a line.
b.
(in a coordinate system) the distance from the origin to the point at which a curve or line intersects an axis.
00:10
Intercept is a GRE word you need to know.
So is introductory. Does it mean:
a short interval between the acts of a play or parts of a public performance, usually a period of approximately 10 or 15 minutes, allowing the performers and audience a rest.
used to begin

Origin:
1535–45; < Latin interceptus past participle of intercipere, equivalent to inter- inter- + -cep- (combining form of cap-, stem of capere to take) + -tus past participle suffix; cf. incipient

in·ter·cep·tive, adjective
non·in·ter·cept·ing, adjective
non·in·ter·cep·tive, adjective
un·in·ter·cept·ed, adjective
un·in·ter·cept·ing, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
intercept
 
vb
1.  to stop, deflect, or seize on the way from one place to another; prevent from arriving or proceeding
2.  sport to seize or cut off (a pass) on its way from one opponent to another
3.  maths to cut off, mark off, or bound (some part of a line, curve, plane, or surface)
 
n
4.  maths
 a.  a point at which two figures intersect
 b.  the distance from the origin to the point at which a line, curve, or surface cuts a coordinate axis
 c.  an intercepted segment
5.  (US), (Canadian) sport the act of intercepting an opponent's pass
 
[C16: from Latin intercipere to seize before arrival, from inter- + capere to take]
 
inter'ception
 
n
 
inter'ceptive
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

intercept
c.1540, from L. interceptus, pp. of intercipere "take or seize between," from inter- "between" + -cipere, comb. form of capere "to take, catch" (see capable).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
intercept   (ĭn'tər-sěpt')  Pronunciation Key 
In a Cartesian coordinate system, the coordinate of a point at which a line, curve, or surface intersects a coordinate axis. If a curve intersects the x-axis at (4,0), then 4 is the curve's x-intercept; if the curve intersects the y-axis at (0,2), then 2 is its y-intercept.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Every day, they intercept an illicit flow of narcotics, money and weapons
  headed both north and south across the border.
Yet they seem almost powerless to spot or intercept the small inflatable skiffs
  employed by pirates to sneak up on their victims.
There are things called intercept and slope in linear estimation that you were
  trying to perform.
The way to cut off a fission chain reaction, then, is to intercept the neutrons.
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