Definition of "Adm"

Particularly notable was the presence not just of Nato’s military chief, the American Gen Christopher Cavoli, but also Adm Sir Tony Radakin, Britain’s most senior military officer, who is now acknowledged in Washington and Kyiv as an increasingly important actor in helping Ukraine overcome the Russian invaders.

2023 August 26, Dan Sabbagh, “‘That’s our guy’: how UK military chief became key Nato liaison in Ukraine”, in The Guardian‎