One of the mysteries of the English language finally explained.
Attributive Designating a numerical rating given to racehorses based on past performance by the periodical Timeform; relating to such ratings. Frequently in "Timeform rating". [Timeform is a trademark.]
1940s; earliest use found in Timeform. From Timeform, the name of a weekly British publication (first published in 1948) which details the performance of racehorses, and of the system which it uses to rate this from time + form.
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