need-n; 3 Senses

Sense Number 1: a requirement, necessity

Commentary: NEED[+state][+necessity] a condition requiring relief; anything that is necessary but lacking

There is no need to make a reservation at that restaurant.
The needs of the community are not being met by the current senior center.
Plants have the basic needs of water, nutrient and sunlight.
At the moment their company has a great need for electrical engineers.
You may carry a few personal needs with you in one small carry-on bag.

PropBank: need.01
WordNet 3.0 Sense Numbers: 1

Sense Number 2: motive, urge, desire

Commentary: NEED[+state][+internal][+urge][+physical/+mental] 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
NOTE: implies an agent with a motive, urge

We are feeling the need to get on with this project.
The patient described a constant need to urinate.
Mary doesn't understand John's need to always criticize everything.
These rawhide strips will satisfy your dog's need to chew.

PropBank: need.01
WordNet 3.0 Sense Numbers: 3

Sense Number 3: poverty, destitution

Commentary: NEED[+event][+state][+social][+poverty] a state of poverty or destitution

The charities provide food at Thanksgiving for families in need.
A general state of need exists among the homeless.
He always helped his neighbors in times of need. (extension of core usage)

PropBank: need.01
WordNet 3.0 Sense Numbers: 4