We don't have synonyms for arbitrar yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are arbitrary, arbiter and arbitrate.
°(usually of a decision) Based on individual discretion or judgment; not based on any objective distinction, perhaps even made at random.
"Benjamin Franklin's designation of "positive" and "negative" to different charges was arbitrary. In fact, electrons flow in the opposite direction to conventional current."
""The Russian trials were Stalin's purges, with which he attempted to consolidate his power. Like most people in the West, I believed these show trials to be the arbitrary acts of a cruel dictator." ()"
°(usually of a decision) Based on individual discretion or judgment; not based on any objective distinction, perhaps even made at random.
"Benjamin Franklin's designation of "positive" and "negative" to different charges was arbitrary. In fact, electrons flow in the opposite direction to conventional current."
""The Russian trials were Stalin's purges, with which he attempted to consolidate his power. Like most people in the West, I believed these show trials to be the arbitrary acts of a cruel dictator." ()"