Serving the purpose of annotation; relating to or characterized by adding explanatory notes or comments.
From 'annotate' plus the adjective suffix '-ive' meaning 'tending to' or 'relating to.' This formal adjective appears primarily in academic and technical writing rather than everyday speech.
The 'annotative' layer in design software is literally named after the 2,000-year-old practice of writing notes on things—computer engineers borrowed the concept and the word directly to describe how we add information without changing the original document.
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