Appositive: a noun or noun substitute placed next to (in apposition to) another noun to be described or defined by the appositive. The appositive can be placed before or after the noun:

• Henry Jameson, the boss of the operation, always wore a red baseball cap.
• A notorious annual feast, the picnic was well attended.
• That evening we were all at the concert, a really elaborate and exciting affair.

With very short appositives, the commas setting off the second noun from the first are often omitted:

• That afternoon Kathy Todd the pianist met the poet Thompson.
• Is your friend George going to run for office?