noun, often attributive
pos·​si·​bi·​list | \-lə̇st\
plural -s

Definition of possibilist 

: a member of a political party that attempts (as in the way of reform) only what is regarded as immediately possible or practicable: such as

a : one of a party of Republicans in Spain

b : one of a party of Socialists in France

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History and Etymology for possibilist

French possibiliste, from Latin possibilis + French -iste -ist

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