Past tense of postpone, meaning delayed or rescheduled to a later time. However, 'postposted' is non-standard; the correct form is 'postponed'.
This appears to be a non-standard formation combining 'post-' (after) with 'posted'. The correct word 'postponed' comes from Latin 'postponere' - 'post' (after) plus 'ponere' (to place).
This is a fascinating example of language evolution in action - speakers sometimes create 'logical' but incorrect forms by analogy. While 'postposted' isn't standard English, it shows how our minds naturally try to make language more regular and predictable, even when it creates redundancy.
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