Merriam-Webster's Collegiate® Dictionary, 11th Edition
CONDITION
I. noun see: diction
Date: 14th century
1. a premise upon which the fulfillment of an agreement depends ; stipulation , covenant , a provision making the effect of a legal instrument contingent upon an uncertain event, something essential to the appearance or occurrence of something else ; prerequisite : as, an environmental requirement , the subordinate clause of a conditional sentence,
3. a restricting or modifying factor ; qualification , an unsatisfactory academic grade that may be raised by doing additional work,
4. a state of being , social status ; rank , a usually defective state of health , a state of physical fitness or readiness for use , attendant circumstances ,
5. temper of mind, trait , manners, ways ,
II. verb (conditioned; conditioning)
Date: 15th century
intransitive verb to make stipulations, transitive verb to agree by stipulating, to make conditional,
3. to put into a proper state for work or use, air-condition , to give a grade of condition to,
5. to adapt, modify, or mold so as to conform to an environing culture , to modify so that an act or response previously associated with one stimulus becomes associated with another, conditionable adjective