Pronunciation: [sˈɛvɪntˌi͡əθ] (IPA) 
The word "seventieth" is spelled with ten letters and four syllables: sev-en-ti-eth. In IPA phonetic transcription, it is represented as /ˈsɛvəntiəθ/. The first syllable is pronounced like "SEV" with a short "e" sound, followed by "en" with a schwa sound, "ti" with a short "i" sound, and "eth" with a voiced "th" sound. The word refers to the ordinal number corresponding to the number 70, as in "Today is my seventieth birthday."
Seventieth is an adjective that pertains to the number 70 in a sequence or series. It is derived from the cardinal number seventy, which represents the quantity or position of something in a group.
In terms of numerical order, seventieth denotes the item or event that comes after the sixty-ninth in a sequence of 70 elements. It is the ordinal form of the number 70 and can be found in counting, ranking, or organizing objects, people, or events that follow a specified order. For example, if there are 70 participants in a race, the runner who finishes in the position immediately after the sixty-ninth would be considered the seventieth place finisher.
Furthermore, seventieth can also indicate a division of a whole into 70 equal parts. This might be relevant in certain calculations or measurements involving fractions, percentages, or statistical data. It implies that one unit out of 70 corresponds to the seventieth part.
The term seventieth does not have specific connotations or associations beyond its numerical meaning. Its significance lies in its connection to the number 70 and its role in ordering, counting, or dividing a whole into equal parts.
The ordinal of seventy.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "seventieth" is derived from the combination of two words: "seventy" and "-th".
1. "Seventy": This term originated from the Old English word "seofontig", which has Germanic roots. The word "seofon" means seven, and "tig" stands for ten. This connection reflects the base number system in which seventy is seen as the product of seven multiplied by ten.
2. "-th": The suffix "-th" is used to form ordinal numbers. It is derived from Old English "-ta" or "-tha", which comes from the Germanic suffix "-tō".
Combining these elements, "seventieth" represents the ordinal number of seventy in the decimal system.
