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The first two in the sequence are by far the most common; 'tertiary' appears occasionally, and higher numbers are rare except in specialized contexts ('quaternary period'). The Greek series proto- , deutero- , trito- , ... is only found in prefixes, generally scholarly and technical coinages, e.g. protagonist, deuteragonist, tritagonist ...
The exception is pertama, which means "first". Numbers in Filipino are preceded by the ordinal prefix ika-or pang-(the latter subject to sandhi; for example, ika-7 or pam-7 "seventh"). The exception is una, which means "first". In Chinese and Japanese, an ordinal number is prefixed by 第 dì / dai; for example: 第一 "first", 第二 "second".
linear the degree of a polynomial is 1; also for explicitly denoting the first power of a unit: linear metre; unity in mathematics; protagonist first actor in theatre of Ancient Greece, similarly Proto-Isaiah and proton; 2: couple; brace, from Old French "arms" (the plural of arm), as in "what can be held in two arms". pair
Based on the ordinary ordinals is another series of adjectives: prīmārius 'of the first rank', secundārius 'of the second class, of inferior quality', tertiārius 'containing a third part', quārtārius 'a quarter, fourth part', quīntārius 'containing five parts', 'five-sixths', sextārius 'a one-sixth part of a congius, 'pint', and so on.
The second (symbol: s) is a unit of time, historically defined as 1 ⁄ 86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units (SI) is more precise:
(This is akin to how the first and second "cuts" of the hour are likewise indicated by prime and double prime symbols, and also the first and second cuts of the degree.) Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as 2 + 3 / 8 ...
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In the US, according to the Merriam-Webster Collegiate Dictionary and The American Heritage Dictionary of the English Language, the British spelling is an also-ran, yet the pronunciation with second-syllable stress is a common variant. In Britain the second syllable is usually stressed. mum(my) mom(my) Mother.