A real or imagined line that marks the edge or limit of an area, activity, or idea.
From “bound,” meaning “limit,” plus the suffix “-ary,” which forms nouns and adjectives. It grew from talking about land limits into describing emotional and social limits too.
A boundary can be a fence, a border, or just a sentence like “I’m not okay with that.” The same word that once only fenced off land now fences off personal space and mental health.
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