What is the meaning of yearly?

noun

• A reference book that is published regularly once every year.
  • synonyms: annual, yearbook

adjective

• Occurring or payable every year.
  • usage: "an annual trip to Paris"; "yearly medical examinations"; "annual (or yearly) income"
  • synonyms: annual

adverb

• Without missing a year.
  • usage: "they travel to China annually"
  • synonyms: annually, every year, each year