to make a person or an animal think or behave in a certain way by influencing or training them over a period of time [↪ conditioning]:
People are conditioned by society.
condition somebody to do something
Many women are conditioned from birth to be accepting rather than questioning.
2 [transitive] formal
to control or decide the way in which something can happen or exist [= determine]:
What I buy is conditioned by the amount I earn.
3 [intransitive and transitive]DCB
to keep hair or skin healthy by putting a special liquid on it [↪ conditioner]:
a shampoo that washes and conditions all in one