Definition of conjectural adjective from the Oxford Advanced Learner's Dictionary

 

conjectural

 adjective
adjective
BrE BrE//kənˈdʒektʃərəl//
 
; NAmE NAmE//kənˈdʒektʃərəl//
 
 
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(of an opinion or idea) not based on definite knowledge; formed by guessing Some of the stages of the earth’s development are purely conjectural.