What does plausible mean?

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From our dictionary:

plau•si•ble

Pronunciation: (plô'zu-bul), [key]
adj.
1. having an appearance of truth or reason; seemingly worthy of approval or acceptance; credible; believable: a plausible excuse; a plausible plot.
2. well-spoken and apparently, but often deceptively, worthy of confidence or trust: a plausible commentator.