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

 

ostensible

 adjective
adjective
BrE BrE//ɒˈstensəbl//
 
; NAmE NAmE//ɑːˈstensəbl//
 
[only before noun](formal)
 
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seeming or stated to be real or true, when this is perhaps not the case synonym apparent The ostensible reason for his absence was illness. Word Origin mid 18th cent.: from French, from medieval Latin ostensibilis from Latin ostens- ‘stretched out to view’, from the verb ostendere, from ob- ‘in view of’ + tendere ‘to stretch’.
See the Oxford Advanced American Dictionary entry: ostensible