Adelaide (original German: Adelheid)'s father Prince Frederick was a younger son of George II of Saxe-Meiningen by his second wife Feodora of Hohenlohe-Langenburg.

On 3 August 1914, at the beginning of World War I, Adelaide married Prince Adalbert of Prussia at Wilhelmshaven, Schleswig-Holstein, Germany.

Less than a month after their marriage, Prince Adalbert was reported to have been killed in battle in Brussels.

[1] She and Prince Adalbert had three children: After William II abdicated in 1918 at the end of World War I, Prince Adalbert sought refuge on his yacht, which had been maintained by a loyal crew.

[3] Princess Adelaide and their children soon attempted to follow, travelling by train from Kiel.