#estimation__estimate__approximation__idea  an approximate calculation of quantity or degree or worth; "an estimate of what it would cost"; "a rough idea how long it would take"
  supertype:  figuring__calculation__computation__reckoning  problem solving that involves numbers or quantities
  subtype:  guesswork__guess__gues__shot__dead_reckoning  an estimate based on little or no information
  subtype:  guesstimate__guestimate  an estimate that combines reasoning with guessing
  subtype:  overrating__overestimate__overestimation__overreckoning  a calculation that results in an estimate that is too high
  subtype:  underestimate__underestimation__underrating__underreckoning  a calculation that results in an estimate that is too low

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