Where does “seachtain” come from?

seachtain (Irish) comes from Old Irish sechtmain, from Latin septimāna, from Latin septimānus, from Latin septimus, from Latin Septem, from Proto-Italic septem, from Proto-Indo-European septḿ̥ — seven.

seachtain (Irish): week

Definitions

  1. week

Ancestry of “seachtain”, step by step

StepLanguageWordMeaning
1Old Irishsechtmainweek
2Latinseptimānaweek
3Latinseptimānusof or pertaining to the seventh in a series
4Latinseptimusseventh
5LatinSeptemseven; 7
6Proto-Italicseptemseven
7Proto-Indo-Europeanseptḿ̥seven

Words derived from “seachtain”

Every word from Proto-Indo-European septḿ̥ →Every word from Proto-Italic septem →Every word from Latin Septem →