What is the meaning of annual?

noun

• Botany) a plant that completes its entire life cycle within the space of a year. (
• A reference book that is published regularly once every year.
  • synonyms: yearly, yearbook

adjective

• Completing its life cycle within a year.
  • usage: "a border of annual flowering plants"
  • synonyms: one-year
• Occurring or payable every year.
  • usage: "an annual trip to Paris"; "yearly medical examinations"; "annual (or yearly) income"
  • synonyms: yearly