Ostensible is used to describe something that seems or is said to be true or real, but is possibly not true or real. In other words, it is plausible rather than demonstrably true or real.

// The ostensible purpose of a filibuster is to extend debate, but in reality it is used to delay or prevent action.

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“No drums, no bass, no conventional song structures: Hosianna Mantra was a 40-minute contemplation of the cosmos and cosmic love, couched in words and sounds that explicitly linked it to humanity’s grandest and most consistent way of considering meaning, religion. The ostensible polytheism conveyed by the name and the concept were only ways to realize how little we actually know, and how much we wager through mere survival.” — Grayson Haver Currin, Pitchfork, 19 Jan. 2025

British philosopher and economist Jeremy Bentham once wrote to Indian religious leader Ram Mohan Roy asking him to “send me two letters—one confidential, another ostensible.” By ostensible he meant that, unlike the confidential letter, the latter was intended to be shown to people other than Bentham himself. This sense of ostensible shows clearly the influence of the word’s Latin ancestor, the verb ostendere, meaning “to hold out for inspection,” “to show,” “to make clear by one’s actions,” and “to demonstrate.” Ostensible is still used today as it is in Bentham’s letter, but it is much more likely to suggest a discrepancy between a declared or implied aim or reason (i.e., the aim or reason that someone displays or “shows” to others) and the true one. For example, someone might give “seeing an old friend” as their ostensible reason for planning a trip when in reality they are planning on spending most of their time relaxing on the beach.