horizon

When you look out your window and note the furthest point you can see––the line where the sky meets the earth––that edge is called the horizon. Horizon can also mean the edge of something in a figurative sense.

When you are thinking about your life, it can be difficult to get very far beyond where you are. Teenagers have a hard time imagining beyond the horizons of young adulthood. People expecting a baby often put much of their focus on infancy––having a child who can sit up or even walk is beyond the horizons of their thinking.

Definitions of horizon
  1. noun
    the line at which the sky and Earth appear to meet
    synonyms: apparent horizon, sensible horizon, skyline, visible horizon
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    type of:
    line
    a spatial location defined by a real or imaginary unidimensional extent
  2. noun
    the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
    synonyms: celestial horizon
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    type of:
    great circle
    a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
  3. noun
    the range of interest or activity that can be anticipated
    “It is beyond the horizon of present knowledge”
    synonyms: purview, view
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    type of:
    ambit, compass, orbit, range, reach, scope
    an area in which something acts or operates or has power or control: "the range of a supersonic jet"
  4. noun
    a specific layer or stratum of soil or subsoil in a vertical cross section of land
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    examples:
    A horizon
    the top layer of a soil profile; usually contains humus
    B horizon
    immediately below the A-horizon; contains deposits of organic matter leached from surface soils
    C horizon
    beneath the B-horizon and above the bedrock; consisting of weathered rock
    types:
    soil horizon
    a layer in a soil profile
    geological horizon
    a layer of rock with a particular composition (especially of fossils); for dating the stratum
    type of:
    stratum
    one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
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