Kaiser/ˈkaɪzər/ Definition 1 of 2Pro Tip 1/3Historical Leader Used for German emperors, specifically pre-1918 during the German Empire. The kaiser's decree changed the course of history. Pro Tip 2/3Not Current Don't use it for modern leaders; 'kaiser' is not a title in contemporary politics. Angela Merkel was the Chancellor, not the kaiser. Pro Tip 3/3Respectful Tone Carries connotations of power and respect, appropriate for formal and historical contexts. The kaiser received ambassadors from across Europe.