seriesseries

Series comes from Latin seriēs ‘a row’, from Proto-Italic *serō ‘to join, bind, link’, and ultimately from Proto-Indo-European *ser-.

1. Proto-Indo-Europeanc. 4500–2500 BCE*ser-¹‘to bind’reconstructed
2. Proto-Indo-Europeanc. 4500–2500 BCE*séreti¹reconstructed
3. Proto-Italicc. 1500–700 BCE*serō¹‘to join’reconstructed
4. Latinc. 75 BCE–200 CEserō¹
5. Latinc. 75 BCE–200 CEseriēs¹‘a row’
6. Englishearliest quotation 1806series¹

1. ¹ Wiktionary, English series
2. Earliest quotation in Wiktionary’s entry: 1806, The Authentic Memoirs of Lord Nelson:: “A series of ill health, however, rendered it expedient…”.