Two lines that are orthogonal are perpendicular or intersecting at a right angle, like a t-square used by draftsmen.

The word orthogonal comes from the Greek orthogōnios meaning "right-angled." While this word is used to describe lines that meet at a right angle, it also describes events that are statistically independent, or do not affect one another in terms of outcome.

Definitions of orthogonal
  1. adjective
    having a set of mutually perpendicular axes; meeting at right angles
    “wind and sea may displace the ship's center of gravity along three orthogonal axes”
    synonyms: rectangular
    intersecting at or forming right angles
  2. adjective
    not pertinent to the matter under consideration
    synonyms: extraneous, immaterial, impertinent
    having no bearing on or connection with the subject at issue
  3. adjective
    statistically unrelated
    lacking a logical or causal relation
Word Family