calendar year
noun [ C ]
ukusa period of 365 or 366 days, starting on January 1st and ending on December 31st. In the US a particular calendar year can be referred to as 'calendar 2011, 2012, etc.':
The fund has convincingly beaten its peers over each of the past three calendar years.
The brokerage raised the company's EPS calendar 2012 estimate to $0.90 from $0.85.