Where does “sidenote” come from?

sidenote (English) comes from English Side, from Middle English side, from Old English sīde, from Proto-West Germanic *sīdā, from Medieval Latin sida, from Late Latin seta, from Latin saeta, from Proto-Italic saitā — to satiate, satisfy.

sidenote (English): Alternative form of side note

Definitions

  1. Alternative form of side note

Ancestry of “sidenote”, step by step

sidenote traces back through two separate lines of ancestry.

via English Side

StepLanguageWordMeaning
1EnglishSideA bounding straight edge of a two-dimensional shape
2Middle Englishsidecustom
3Old Englishsīdeside, flank
4Proto-West Germanic*sīdāside
5Medieval Latinsida—
6Late LatinsetaAlternative form of saeta; hair, bristle; bristle
7Latinsaetaa bristle, hair on an animal; silk
8Proto-Italicsaitā—
9Proto-Indo-Europeanséh₂ito-—
10Proto-Indo-Europeansh₂ey-to bind, fetter
11Proto-Indo-Europeanseh₂-to satiate, satisfy

via English Note

StepLanguageWordMeaning
1EnglishNoteThe St. Louis Blues hockey team
2Middle Englishnotenote; Alternative form of not
3Old Englishnotuuse; enjoyment; profit, advantage, utility
4Proto-Germanicnutōuse, profit, yield
5Proto-Indo-Europeannewd-to seize; grasp; use; to grasp, seize, use; to...
Every word from Proto-Indo-European seh₂- →Every word from Proto-Indo-European sh₂ey- →Every word from Proto-Indo-European séh₂ito- →