is to be read as primo meaning "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 was introduced for temperature in the later 18th century and became widespread in the early 19th century.Īntoine Lavoisier in his "Opuscles physiques et chymiques" (1774) used the ordinal indicator with Arabic numerals – for example, when he wrote 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, became 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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