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Definition of valuation:
Synonyms:
estimate, military rating, evaluation, appraisement, worth, estimate, paygrade, judgment, judgment, military rank, rating.

calculation (part of speech: noun)
 division,
 calculus,
 measurement,
 consideration,
 gauge,
 plot,
 reckoning,
 appraisal,
 assessment,
 statistics,
 scheme,
 count,
 algorithm,
 program,
 quantification,
 total,
 account,
 method,
 multiplication,
 inference,
 determination,
 guess,
 computation,
 estimation,
 deduction,
 calculation,
 presumption,
 schedule,
 study,
 tally,
 plan,
 value,
 mathematics,
 thought,
 supposition,
 sum,
 algorithm,
 rank,
 system,
 score,
 algebra,
 arithmetic,
 enumeration,
 judgement,
 approximation,
 triangulation,
 evaluation,
 conclusion
Usage examples:

Using the Bridge count, the adversaries, if strong in the red suits, were apt to bid, but the black suits, by reason of their low valuation, frequently could not be called.
 "Auction of Today", Milton C. Work. 
The whole of her training under Baroni, with the big future that it held, tended to give her a somewhat egotistical outlook, an instinctive feeling that everything must of necessity subordinate itself to her demands an excellent foundation, no doubt, on which to build up a reputation as a famous singer in a world where people are apt to take you very much at your own valuation, but a poor preparation for the sacrifices and self immolation that love not infrequently demands.
 "The Splendid Folly", Margaret Pedler. 
I admired Jim's loyalty to his late master, if not his veracity, at the valuation of the stock, which I took over as it stood.
 "Grain and Chaff from an English Manor", Arthur H. Savory.