1. Arbor Day - Noun
2. Arbor Day - Proper noun
a day designated for planting trees
Source: WordNetArbor Day is not like other holidays. Each of those reposes on the past, while Arbor Day proposes for the future. Julius Sterling Morton
A newly formed Youth Desk will communicate with all of the schools in the Kloof area about various projects (Arbor Day, walking and cycling route map). Source: Internet
For more than two decades, the city has been designated a “Tree City USA” by the Arbor Day Foundation, an award that highlights the city’s commitment to tree care. Source: Internet
Arbor Day has been observed in Australia since 20 June 1889. Source: Internet
By the 1920s, each state in the United States had passed public laws that stipulated a certain day to be Arbor Day or Arbor and Bird Day observance. Source: Internet
Costa Rica "Día del Árbol" is on June 15. Egypt Arbor Day is on January 15. Germany Arbor Day ("Tag des Baumes") is on 25 April. Source: Internet