interlock

[v. in-ter-lok, in-ter-lok; n. in-ter-lok]
verb (used without object)
1.
to fit into each other, as parts of machinery, so that all action is synchronized.
2.
to interweave or interlace, one with another: The branches of the trees interlock to form a natural archway.
3.
Railroads. (of switches, signals, etc.) to operate together in a prearranged order.
verb (used with object)
4.
to lock one with another.
5.
to fit (parts) together to ensure coordinated action.
6.
Railroads. to arrange (switches, signals, etc.) to effect a predetermined sequence of movement.
noun
7.
the fact or condition of interlocking or of being interlocked.
8.
the existence or an instance of an interlocking directorate.
9.
a device for preventing a mechanism from being set in motion when another mechanism is in such a position that the two operating simultaneously might produce undesirable results.
10.
Also called ignition interlock. a device or system that prevents an automotive engine from starting until the seat belt for any occupied front seat is fastened.
11.
a stretch fabric made with a circular knitting machine having two alternating sets of long and short needles.
12.
Movies. a device for synchronizing the action of a camera and sound recorder.

Origin:
1625–35; inter- + lock1

interlocker, noun
uninterlocked, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interlock
 
vb
1.  to join or be joined firmly, as by a mutual interconnection of parts
 
n
2.  the act of interlocking or the state of being interlocked
3.  a device, esp one operated electromechanically, used in a logic circuit or electrical safety system to prevent an activity being initiated unless preceded by certain events
4.  a closely knitted fabric
 
adj
5.  (of fabric) closely knitted
 
'interlocker
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The teeth on those gears aren't even and the way they interlock mean they'd
  never turn.
If two people feel vulnerable simultaneously, these two tendencies can
  interlock and increase synergistically.
Each molar has three distinct cusps that interlock when their jaw is closed,
  forming a sieve for straining krill from the water.
Surrounding this tube is a sheath consisting of three steel segments designed
  so that they interlock and form a circular jacket.
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