Third-century starter

• 201 on a slab
• One-fifteenth of MMMXV
• Start of the third century
• 201, on a monument
• MMX ÷ X
• LXVII thrice
• Early third-century date
• 201 to Caesar
• New Jersey area code, in ancient Rome (oh, did you want to do Roman numeral math? That's what I thought)

Wiktionary Word definitions in Wiktionary
init. (context telecommunications English) http://en.wikipedia.org/wiki/Co-channel%20interference