Open English Wordnet
Nouns
(n)order, order of magnitudea degree in a continuum of size or quantity“it was on the order of a mile”, “an explosion of a low order of magnitude”
(n)order of magnitude, magnitudea number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10