The story
- Proto-Indo-European*úp
- Proto-Indo-European*upér
- Proto-Germanic*uber
- Old Englishofer-
- Middle Englishover-
- Englishover-
- Proto-Indo-European*h₁én
- Proto-Italic*en
- Proto-Italic*en-
- Latinin-
- Proto-Indo-European*kleh₂w-
- Proto-Italic*klaudō
- Latinclaudō
- Latininclūdō
- Latininclūsus
- Medieval Latininclūsīvus
- Middle Frenchinclusif
- Englishinclusive
- Englishoverinclusive
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todayoverinclusively
From overinclusive + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.