longitudinal longitudinal  /ˌlɑn dʒə ˈtu də nəl/


  1. (adj) of or relating to lines of longitude
  2. (adj) running lengthwise
  3. (adj) over an extended time


  1. A series of longitudinal studies of home nurse visits have found that they can have powerful positive outcomes for both parents and children.
  2. A large longitudinal study finds that TV- and DVD-viewing in babies appears to have no impact on their later language and motor skills.
  3. At least those are the findings reported in Spousal Bereavement in Late Life, a book based on a longitudinal study of 1,500 older married couples.


  1. PeriGen Implements PeriCALM Fetal Surveillance Solution at Mary Greeley Medical Center

    PeriCALM Simultaneously Integrated With Enterprise EHR to Create a Complete, Real-Time Longitudinal Record for Mother and Baby
    on June 17, 2013     Source: Marketwire

  2. ANN's Daily Aero-Term (06.16.13): Tailwind

    Tailwind Any wind more than 90 degrees to the longitudinal axis of the runway. The magnetic direction of the runway shall be used as the basis for determining the longitudinal axis.
    on June 16, 2013     Source: The Aero-News Network


  1. "Longitudinal data is not just a K-12 issue; it requires gubernatorial commitment because all of our systems - from early childhood, to K-12 education, to colleges and universities, to workforce development, to employment databases - must work...
    on Mar 12, 2009 By: Ed Rendell Source: Earthtimes (press release)

  2. "Massachusetts is a champion of accountability and has some of the nation's highest standards. I commend Massachusetts for already using a cohort longitudinal graduation rate in line with that of the National Governors' Association. I am also...
    on May 6, 2008 By: Margaret Spellings Source: U.S. Department of Education (press release)

  3. "The conventional recording technology, longitudinal, is reaching the end of its life. Perpendicular recording is required to extend storage beyond 2.5-inch 80 gigabytes per disk, which is the highest volume market right now in terms of growth,"...
    on Jun 6, 2006 By: Donovan Source: TechNewsWorld

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