Capable of being seen or watched. In digital contexts, refers to content that can be displayed or accessed.
From Middle English 'viewen' (to see) plus the suffix '-able' (capable of). 'View' comes from Old French 'veue', from Latin 'videre' meaning 'to see'. The modern digital sense emerged with computer interfaces in the late 20th century.
In the digital advertising world, 'viewable' has a very specific technical meaning - an ad is only considered viewable if at least 50% of it appears on screen for at least one second, which has huge implications for online marketing budgets!
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