1. formation

an arrangement of people or things acting as a unit

Example Sentences:
'a defensive formation'
'a formation of planes'

2. formation, shaping

the act of fabricating something in a particular shape

• shaping

3. constitution, establishment, formation, organisation, organization

the act of forming or establishing something

Example Sentences:
'the constitution of a PTA group last year'
'it was the establishment of his reputation'
'he still remembers the organization of the club'

• constitution
• establishment
• organisation
• organization

4. formation, geological formation

(geology) the geological features of the earth

• geological formation

5. formation

a particular spatial arrangement

6. formation

natural process that causes something to form

Example Sentences:
'the formation of gas in the intestine'
'the formation of crystals'
'the formation of pseudopods'

7. formation

creation by mental activity

Example Sentences:
'the formation of sentences'
'the formation of memories'