1. An approximate calculation of quantity or degree or worth (synset 105811387)
    "an estimate of what it would cost"; "a rough idea how long it would take"
  2. The quality of coming near to identity (especially close in quantity) (synset 104751272)
  3. An imprecise or incomplete account (synset 106796299)
    "newspapers gave only an approximation of the actual events"
  4. The act of bringing near or bringing together especially the cut edges of tissue (synset 100147097)

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