Synonyms for Estimation:

n.

impression, opinion, feeling, stand, stance, self-assessment, view, judgment, reputation, attitude, viewpoint. Estimating, calculating. Appraisement. precise. appreciation, respect, favor, honor, admiration. belief (noun)
opinion.
belief, guess (noun)
consideration, Estimating, assessment, impression, calculating, estimate, appraisal, view, valuation, judgment, favor, arithmetic, computation, respect, admiration, evaluation, reckoning, opinion, appreciation.
calculation (noun)
determination, program, enumeration, score, calculation, sum, count, deduction, scheme, statistics, supposition, judgement, appraisal, quantification, calculus, mathematics, approximation, reckoning, study, valuation, measurement, value, plan, computation, algorithm, rank, arithmetic, guess, gauge, inference, tally, account, assessment, multiplication, method, total, system, thought, consideration, presumption, plot, evaluation, schedule, triangulation, conclusion, algebra, division.
cognition (noun)
estimate.
communication (noun)
estimate, appraisal.
estimation (noun)
approximation, appraisal, estimate, idea.
measurement (noun)
quantification.
thought (noun)
thought.

Other synonyms:

Appraisement, reputation. opinion, judgment. appreciation. honor. esteem
admiration.
Other relevant words:
attitude, view, calculating, admiration, estimate, feeling, favor, Estimating, viewpoint, honor, impression, self-assessment, judgment, respect, precise, reputation, Appraisement, appreciation, idea, stand, opinion, stance.

Usage examples for estimation

  1. There was little that could raise Peter in their estimation but they understood very well that he had become a man of vast importance, as it seemed to them. – The Honorable Peter Stirling and What People Thought of Him by Paul Leicester Ford
  2. Added to this was the under- estimation of the influence of the United States on the development of world politics. – My Three Years in America by Johann Heinrich Andreas Hermann Albrecht Graf von Bernstorff
  3. To address her son as " Lord Diphoos" was in her ladyship's estimation crushing, but Tom did not seem crushed. – Lady Maude's Mania by George Manville Fenn