Related Clues:

• Long time, for short
• Jr. and sr
• Timeline nos
• Age abbr
• 1949 and 2004, abbr
• They take months to complete (Abbr.)
• Abbr. before 'truly'
• Era divisions: Abbr
• Decade divs
• Cent. fractions
• Century parts (Abbr.)
• 2013 and 2014, e.g
• Revolutions, perhaps: Abbr
• Century divs
• 1999 and 2015, for short