need

require as useful, just, or proper

It takes nerve to do what she did

have need of

This piano wants the attention of a competent tuner

a condition requiring relief

she satisfied his need for affection

anything that is necessary but lacking

he had sufficient means to meet his simple needs

the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior

we did not understand his motivation