Definition of "Need" :

noun: 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

noun: anything that is necessary but lacking

"He had sufficient means to meet his simple needs."

noun: a condition requiring relief

"She satisfied his need for affection."

noun: a state of extreme poverty or destitution

"A general state of need exists among the homeless."

verb: have need of

verb: have or feel a need for

"Always needing friends and money."

verb: require as useful, just, or proper