magnum opus /magˈnəm ōˈpəs, magˈnŭm opˈŭs/ (Latin)

1. A great work, esp of literature or learning
2. A writer's greatest achievement or the culmination of his or her efforts

• imperishable
• imperishableness
• imperishably
• imperium
• imperium in imperio
• impermanence
• impermanences
• impermanencies
• impermanency
• impermanent
• impermanently
• impermeabilities
• impermeability
• impermeable
• impermeableness
• impermeablenesses
• impermeably
• impermissibility
• impermissible
• impermissibly
• impers.
• imperseverant
• impersistent
• impersonal
• impersonalisation