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a network of U.S. highways connecting the 48 contiguous states and most of the cities with populations above 50,000, begun in the 1950s and estimated to carry about a fifth of the nation’s traffic.


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  • Interstation

    [stey-shuh n] /ˈsteɪ ʃən/ noun 1. a place or position in which a person or thing is normally located. 2. a stopping place for trains or other land conveyances, for the transfer of freight or passengers. 3. the building or buildings at such a stopping place. 4. the district or municipal headquarters of certain public […]

  • Interstellar medium

    noun 1. the matter occurring between the stars of our Galaxy, largely in the spiral arms, and consisting mainly of huge clouds of ionized, neutral, or molecular hydrogen ISM interstellar medium (ĭn’tər-stěl’ər) Material, mostly hydrogen gas, other gases, and dust, occupying the space between the stars and providing the raw material for the formation of […]

  • Interstellar

    [in-ter-stel-er] /ˌɪn tərˈstɛl ər/ adjective 1. Astronomy. situated or occurring between the stars: interstellar dust. /ˌɪntəˈstɛlə/ adjective 1. conducted, or existing between two or more stars adj. 1620s, “situated between the stars,” from inter- + stellar.

  • Interstice

    [in-tur-stis] /ɪnˈtɜr stɪs/ noun, plural interstices [in-tur-stuh-seez, -stuh-siz] /ɪnˈtɜr stəˌsiz, -stə sɪz/ (Show IPA) 1. an intervening space. 2. a small or narrow space or interval between things or parts, especially when one of a series of alternating uniform spaces and parts: the interstices between the slats of a fence. 3. Roman Catholic Church. the […]

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