Annus is a Latin term that means year. Many synonyms can be used instead of the word Annus. One of the most commonly used synonyms is "anno," which is also Latin and translates to "in the year of." Another synonym is "calendar year," which signifies the period between January 1st and December 31st. "Solar year" is also another synonym, which refers to the time taken by the earth to complete one orbit around the sun. "Tropical year" is another synonym meaning the time taken for the sun to return to its original position in the sky, and "fiscal year" is the financial year used by companies for accounting and other financial purposes.