The 1 o.is to be read as primo "in the first place", followed by 2 o. a series of experiments firstly, on the existence of that same elastic fluid " sur l'existence du même fluide élastique ( p. Use of the degree symbol is introduced for temperature in the later 18th century and becomes widespread in the early 19th century.Īntoine Lavoisier in his Opuscles physiques et chymiques (1774) uses the ordinal indicator with Arabic numerals, for example when he writes in the introduction: Similarly, the introduction of the temperature scales with "degrees" in the 18th century was at first without such symbols, but with the word gradus spelled out. Use of "degree" specifically for the degrees of arc, used in conjunction with Arabic numerals, becomes common in the 16th century, but this was without the use of an ordinal marker or degree symbol. The number of the "rank" in question was indicated by ordinal numbers, in abbreviation with the ordinal indicator (a superscript o). ![]() The word degree is equivalent to Latin gradus, which since the medieval period could refer to any stage in a "graded" system of ranks or steps.
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