adjective.
Occurring, growing, or existing before the customary, correct, or assigned time; uncommonly or unexpectedly early.
adjective.
Born after a gestation period of less than the normal time.
The Century Dictionary and Cyclopedia
Arriving too early at maturity; mature or ripe before the proper time; hence, coming into existence or occurring too soon; too early; untimely; overhasty.
the GNU version of the Collaborative International Dictionary of English
adjective.
Mature or ripe before the proper time.
adjective.
Happening, arriving, existing, or performed before the proper or usual time; adopted too soon; too early; untimely
adjective.
Arriving or received without due authentication or evidence.
adjective.
Occurring before a state of readiness or maturity has arrived.
adjective.
Taking place earlier than anticipated, prepared for, or desired.
adjective.
Suffering from premature ejaculation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
uncommonly early or before the expected time
adjective.
born after a gestation period of less than the normal time
adjective.
too soon or too hasty
Word Usage
"The most general and inclusive way in which to designate all the phenomena that sociology proper considers, without importing into the term premature hypotheses by way of explanation, is to assert that they are the phenomena of "contact" between persons."