delimit

When you set the boundaries of something, you delimit it. Suburban homeowners often delimit their property lines with tall privacy fences.

You can literally delimit something, the way you might delimit the boundaries of your airplane seat by planting your elbow on the armrest. There is also a figurative way to delimit, like when you delimit your summer schedule in an attempt to keep your cousin from visiting you for a month. Delimit comes from the Latin delimitare, "to mark out as a boundary."

Definitions of delimit
  1. verb
    set, mark, or draw the boundaries of something
    synonyms: delimitate, demarcate
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    type of:
    circumscribe, confine, limit
    restrict or confine, "I limit you to two visits to the pub a day"
  2. verb
    determine the essential quality of
    synonyms: define, delimitate, delineate, specify
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    types:
    determine
    fix in scope; fix the boundaries of
    redefine
    give a new or different definition to
    nail down, narrow, narrow down, peg down, pin down, specify
    define clearly
    type of:
    be
    have the quality of being; (copula, used with an adjective or a predicate noun)
  3. verb
    be opposite to; of angles and sides, in geometry
    synonyms: subtend
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    type of:
    be
    have the quality of being; (copula, used with an adjective or a predicate noun)
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