Learner's definition of OSTENSIBLE
always used before a noun
seeming or said to be true or real but very possibly not true or real
The ostensible reason for his visit was to see an old friend. [=he said the reason was to see an old friend, but the real reason may have been something different]
The ostensible [=apparent] purpose of the article is to encourage young adults to vote.
The story is ostensibly fiction, but some of the events are based on real life.
Ostensibly, the reason for his visit was to see an old friend.