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  1. Dictionary
    Lad·der
    /ˈladər/

    noun

    • 1. a structure consisting of a series of bars or steps between two upright lengths of wood, metal, or rope, used for climbing up or down something.
    • 2. a vertical strip of unraveled fabric in tights or stockings; a run: British "one of Sally's stockings developed a ladder"

    verb

    • 1. (with reference to tights or stockings) develop or cause to develop a run: British "I laddered my tights as I arrived this morning"
  2. 18 hours ago · Sustainability is regarded as a "normative concept".[5] [22] [23] [2] This means it is based on what people value or find desirable: "The quest for sustainability involves connecting what is known through scientific study to applications in pursuit of what people want for the future."

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  4. en.wikipedia.org › wiki › Social_mediaSocial media - Wikipedia

    18 hours ago · The PLATO system was launched in 1960 at the University of Illinois and subsequently commercially marketed by Control Data Corporation.It offered early forms of social media features with innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowdsourced online newspaper, and blog ...

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