Johnson, Lyn ‧ don B. /ˈlɪndən biː/ BrE AmE ( also LBJ informal )
(1908–73) a US politician in the Democratic Party who was known as LBJ and was the President of the US from 1963 to 1969. He first became president when President ↑ Kennedy was killed in 1963, and was elected again in 1964. He then started his plan for a ‘Great Society’ by introducing laws that helped poor people, improved medical care and education, and gave ↑ civil rights to all US citizens whatever their race. When the US became more involved in the Vietnam War, however, he became unpopular.