Because, e.g.: Abbr

• 'And' or 'but' (Abbr.)
• If, and or but: Abbr.
• Word like "and" or "or": Abbr
• Or or nor: Abbr
• Pt. of speech
• Part of speech: Abbr.
• Speech part: Abbr.
• Or or nor: Abbr.
• Dictionary abbr.

Wiktionary Word definitions in Wiktionary
n. (abbreviation of conjunction English)