To compel by physical, moral, or circumstantial force; oblige: felt constrained to object. See Synonyms at force.
To keep within close bounds; confine: a life that had been constrained by habit to the same few activities and friends.
To inhibit or restrain; hold back: "Failing to control the growth of international debt will also constrain living standards"(Ronald Brownstein).
To produce in a forced or inhibited manner.
[Middle English constreinen, from Old French constraindre, constraign-, from Latin cōnstringere, to restrain, compress : com-, com- + stringere, to bind, press together; see streig- in Indo-European roots.] con·strain'a·ble adj., con·strain'ed·ly (-strā'nĭd-lē) adv., con·strain'er n.