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a·pex  audio  (pks) KEY 

NOUN:
pl. a·pex·es or a·pi·ces  (p-sz, p-) KEY 
  1. The highest point; the vertex: the apex of a triangle; the apex of a hill.
  2. The point of culmination. See Synonyms at summit.
  3. The usually pointed end of an object; the tip: the apex of a leaf.
ETYMOLOGY:
Latin


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