Something that is extended has been fully stretched out or elongated. An extended period of time is an extremely long period of time.

To extend something is to make it longer, either physically or in terms of time. Anything extended has been stretched out in this way. An extended rubber band will snap back or break. An extended hose can be used to put out a fire. If you live with your parents in your twenties, it's like an extended childhood.

Definitions of extended
  1. adjective
    fully extended or stretched forth
    “an extended telescope”
    “his extended legs reached almost across the small room”
    “refused to accept the extended hand”
    outspread, spread
    fully extended in width
    fully extended especially in length
    spread out irregularly
    with arms and legs stretched out and apart
    extended or spread over a wide area or distance
    see moresee less
    not extended or stretched out
  2. adjective
    drawn out or made longer spatially
    “the extended airport runways can accommodate larger planes”
    synonyms: elongated, lengthened, prolonged
    primarily spatial sense; of relatively great or greater than average spatial extension or extension as specified
  3. adjective
    relatively long in duration; tediously protracted
    “an extended discussion”
    synonyms: drawn-out, lengthy, prolonged, protracted
    primarily temporal sense; being or indicating a relatively great or greater than average duration or passage of time or a duration as specified
  4. adjective
    large in spatial extent or range or scope or quantity
    extended farm lands”
    “surgeons with extended experience”
    synonyms: extensive
    big, large
    above average in size or number or quantity or magnitude or extent
  5. adjective
    beyond the literal or primary sense
    “`hot off the press' shows an extended sense of `hot'”
    figurative, nonliteral
    (used of the meanings of words or text) not literal; using figures of speech
Word Family

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