A photograph taken by oneself (a selfie in modern terms), or a photograph made by the action of light alone without a camera operator.
From Greek 'auto-' (self) and 'photograph' (light-writing). This term appeared in early photography but is now superseded by the word 'selfie' in popular usage.
The concept of autophotograph is way older than Instagram—photographers in the 1800s would use mirrors and long exposures to take pictures of themselves, making them the original selfie pioneers!
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