verb (used with object)
to force, compel, or oblige: He was constrained to admit the offense.
to confine forcibly, as by bonds.
to repress or restrain: Cold weather constrained the plant's growth.

1275–1325; Middle English constrei(g)nen < Anglo-French, Middle French constrei(g)n- (stem of constreindre) < Latin constringere. See con-, strain1

constrainable, adjective
constrainer, noun
constrainingly, adverb
nonconstraining, adjective
unconstrainable, adjective
unconstraining, adjective

coerce, compel, constrain, force, oblige (see synonym study at oblige).

1. coerce. 2. check, bind.

2. free. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To constrain
World English Dictionary
constrain (kənˈstreɪn)
1.  to compel or force, esp by persuasion, circumstances, etc; oblige
2.  to restrain by or as if by force; confine
[C14: from Old French constreindre, from Latin constringere to bind together, from stringere to bind]

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

mid-14c., from stem of O.Fr. constreindre, from L. constringere "to bind together, tie tightly," from com- "together" + stringere "to draw tight" (see strain (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They may be my fences, but they constrain me as surely as they constrain the
These ingredients limit the chemical reactions that can happen inside cells and
  so constrain what life can do.
So it's public regulation to constrain private regulation.
Not only does this constrain the usual hyperbolic marketing.
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