caption

US /ˈkæp.ʃən/
UK /ˈkæp.ʃən/
"caption" picture
1.

a title or brief explanation appended to an article, illustration, cartoon, or poster

:
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The photograph had a humorous caption.
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Please add a caption to each image in the presentation.
:
legendsubtitleheadingdescription
2.

text displayed on a television or cinema screen to provide additional information or to translate dialogue

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Turn on the captions if you have trouble understanding the dialogue.
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The movie was shown with English captions for the hearing impaired.
:
subtitleclosed captiontext
1.

provide (an illustration, photograph, etc.) with a title or explanation

:
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She decided to caption her Instagram post with a witty remark.
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The editor asked me to caption all the diagrams in the report.
:
labeltitleannotatedescribe