pre·con·di·tion 
(prē′kən-dĭshən)
(prē′kən-dĭshən)n.
A condition that must exist or be established before something can occur or be considered; a prerequisite.
tr.v. pre·con·di·tioned, pre·con·di·tion·ing, pre·con·di·tions
To condition, train, or accustom in advance.