need

1 need /ˈniːd/ verb
needs; needed; needing
1 need
/ˈniːd/
verb
needs; needed; needing
Britannica Dictionary definition of NEED
1 
[+ object] : to be in a condition or situation in which you must have (something) : to require (something)
— often used of things
2 
[+ object]
a  — used to say that some action is necessary — usually followed by to + verb
b  — used to say that it is important and necessary for someone to do something — followed by to + verb
3 
[modal verb] — used to say that something is necessary
— usually used in negative statements and in questions for which the answer is assumed by the speaker to be “no”
◊ The modal verb need is used especially in British English. In U.S. English, it is commonly used in phrases like need not apply and need I say more.

need no introduction

— see introduction
2 need /ˈniːd/ noun
plural needs
2 need
/ˈniːd/
noun
plural needs
Britannica Dictionary definition of NEED
1 
: a situation in which someone or something must do or have something
[noncount]
[singular]
— see also a crying need at crying
2 
[count] : something that a person must have
: something that is needed in order to live or succeed or be happy — usually plural
— see also special needs
3 
[count] : a strong feeling that you must have or do something
4 
[noncount] : a situation in which people do not have things that they need
— see also a friend in need is a friend indeed at friend

if need be

: if something becomes necessary

in need of

— used to say that someone or something needs to have something

no need

— used to say that something is not necessary
— often followed by to + verb
— often + for