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midpoint

or mid-point

[mid-point]
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noun
  1. a point at or near the middle of, or equidistant from, both ends, as of a line: the midpoint of a boundary.
  2. a point in time halfway between the beginning and the end, as of a process, event, or situation: the midpoint of the negotiations.
  3. Geometry. the point on a line segment or an arc that is equidistant, when measured along the line or the arc, from both endpoints.
  4. Statistics. median(def 3).
  5. Astrology. the point on the arc that is equidistant from two planets: regarded as a sensitive point and used in horoscopic interpretations.
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Origin of midpoint

1325–75; Middle English. See mid-, point
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for midpoint

midpoint

noun
  1. the point on a line that is at an equal distance from either end
  2. a point in time halfway between the beginning and end of an event
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for midpoint

n.

late 14c., from mid + point (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper