Martin Luther King Day - definition and synonyms

noun 

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/ˌmɑː(r)tɪn ˌluːθə(r) ˈkɪŋ ˌdeɪ/
singularMartin Luther King Day
pluralMartin Luther King Days
  1. a national holiday in January in the US that celebrates the birthday of Martin Luther King Junior, a leader in the 1960s political movement to get more rights for black Americans
Word story
Martin Luther King Junior was assassinated in Memphis, Tennessee on April 4th 1968. The holiday to mark his birthday was authorized by President Ronald Reagan in 1983.