Boundary
来自Big Physics
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early 17th century: variant of dialect bounder, from bound2 + -er1, perhaps on the pattern of limitary .
wiktionary
bound + -ary, Old French, from Latin.
etymonline
boundary (n.)
"that which indicates the limits of anything," 1620s, from bound (n.1) + -ary. Strictly, a visible mark indicating a dividing line, a bound being the limit or furthest point of extension of any one thing.
