A posse of people is a group of people with the same job or purpose.
[informal]
...a posse of reporters. [+ of]
A posse of Marsh's friends persuaded them that this was a bad idea.
2. countable noun
In former times, in the United States, a posse was a group of men who were brought together by the local law officer to help him chase and capture a criminal.
posse in British English
(ˈpɒsɪ)
noun
1. Also called: posse comitatus US
the men of a district assembled together and forming a group upon whom the sheriff may call for assistance in maintaining law and order
2. law
possibility (esp in the phrase in posse)
3. slang
a Jamaican street gang in the US
4. informal
a group of friends or associates
Word origin
C16: from Medieval Latin (n): power, strength, from Latin (vb): to be able, have power
posse in American English
(ˈpɑsi)
noun
1. See posse comitatus
2.
a body or force armed with legal authority
Word origin
[1575–85; ‹ ML posse power, force, n. use of L inf.: to be able, have power, equiv. to pot- ( see potent1) + -se inf. suffix]
Examples of 'posse' in a sentence
posse
To make that pledge in front of a posse of friends and family is particularly binding.
Times, Sunday Times (2014)
He always had a little posse of friends with him.
Times, Sunday Times (2007)
They are surrounded by empty tarmac, a small posse of streamlined excellence darting west.
Times, Sunday Times (2011)
China's glossy posse are looking for refinement and sophistication.
Times, Sunday Times (2014)
DO come here if you're hitting Ibiza to party hard and want to do it surrounded by the glossy posse.