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  • (acoustics) The point horizontally and vertically centered in front of a microphone or speaker. Certain microphones have different frequency response curves at different points off-axis. A speaker's directivity is measured off axis. Microphones and speakers typically behave differently off axis than they do on axis.
    Source: Church Audio & Acoustics Glossary
  • (geology)
  1. Ridge or place of sharpest folding of an anticline or syncline.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. The central or dominating region of a mountain chain, or the line that follows the crest of a range and thus indicates the most conspicuous part of the uplift.
  3. The centerline of a tunnel. Nichols, 1
  4. Intersection of the axial plane of a fold with a particular bed; axial line.
  5. A straight line about which a body or a three-dimensional figure rotates or may be supposed to rotate; a straight line with respect to which a body, figure, or system of points is either radially or bilaterally symmetrical. Webster 3rd
  6. In crystallography, one of the imaginary lines in a crystal that are used as coordinate of axes of reference in determining the positions and symbols of the crystal planes. CF: crystallographic axes; coordinate system.
  7. Often used synonymously with anticlinal; thus, the Brady's bend axis for Brady's bend anticlinal. See also: anticlinal axis; synclinal axis.
  8. The trace of the axial surface of a fold on the fold profile plane (obsolete).
  9. A line that follows the trend of large landforms, e.g., the crest of a ridge or mountain range, or the bottom or trough of a depression. Plural: axes.
    Source: Dictionary of Mining, Mineral, and Related Terms

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