verb (used without object)
to be emphatic, firm, or resolute on some matter of desire, demand, intention, etc.: He insists on checking every shipment.
to lay emphasis in assertion: to insist on the justice of a claim.
to dwell with earnestness or emphasis (usually followed by on or upon ): to insist on a point in a discussion.
verb (used with object)
to assert or maintain firmly: He insists that he saw the ghosts.
to demand or persist in demanding: I insist that you see this thing through.

1580–90; < Latin insistere to stand still on, persist in, equivalent to in- in-2 + sistere to stand, make stand, reduplicated derivative from base of stāre to stand

insister, noun
insistingly, adverb
overinsist, verb (used without object)
reinsist, verb (used without object)
superinsist, verb (used without object)

5. urge, require. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insist (ɪnˈsɪst)
1.  to make a determined demand (for): he insisted that his rights be respected; he insisted on his rights
2.  to express a convinced belief (in) or assertion (of): he insisted that she was mad; he insisted on her madness
[C16: from Latin insistere to stand upon, urge, from in-² + sistere to stand]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1586, from L. insistere "persist, dwell upon, stand upon," from in- "upon" + sistere "take a stand" (see assist). Insistence is attested from 1436.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nuclear power has many unmatched virtues, its advocates insist.
Insurance companies insist their dizzying array of products meets our need for
  peace of mind.
Skeptics insist this could be due to the power of suggestion.
It's quite another to insist that it's not even a war.
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