1. Ancient Persian religion; popular among Romans during first three centuries a.d.
   - Mithraism

Type of: faith, religion, religious belief

• instance
• instancy
• instant
• instant coffee
• instant replay
• instantaneity
• instantaneous
• instantaneous sound pressure
• instantaneously
• instantaneousness
• instanter
• instantiate
• instantiation
• instantly
• instar
• instate
• instauration
• instead
• instep
• instigant
• instigate
• instigation
• instigative
• instigator
• instil