Why is the ninth month called September?
early 14c., condicioun, from Old French condicion "stipulation, state, behavior, social status" (12c., Modern French condition), from Latin condicionem (nominative condicio) "agreement, situation," from condicere "to speak with, talk together," from com- "together" (see com-) + dicere "to speak" (see diction). Evolution of meaning through "stipulation, condition," to "situation, mode of being."
late 15c., "to make conditions," from condition (n.). Meaning "to bring to a desired condition" is from 1844. Related: Conditioned; conditioning.
condition con·di·tion (kən-dĭsh'ən)
A disease or physical ailment.
A state of health or physical fitness.
conditioning con·di·tion·ing (kən-dĭsh'ə-nĭng)
A process of behavior modification by which a subject comes to associate a desired behavior with a previously unrelated stimulus.
See classical conditioning.