"formations" in the noun sense
1. formation
an arrangement of people or things acting as a unit
"a defensive formation"
"a formation of planes"
2. formation, shaping
the act of fabricating something in a particular shape
3. constitution, establishment, formation, organization, organisation
the act of forming or establishing something
"the constitution of a PTA group last year"
"it was the establishment of his reputation"
"he still remembers the organization of the club"
4. geological formation, formation
geology) the geological features of the earth
5. formation
a particular spatial arrangement
6. formation
natural process that causes something to form
"the formation of gas in the intestine"
"the formation of crystals"
"the formation of pseudopods"
7. formation
creation by mental activity
"the formation of sentences"
"the formation of memories"
Source: WordNet® (An amazing lexical database of English)
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