Exemple:
My brother and boyfriend had never met before, so I made <em>introductions</em> at my party. 
Licence photo:
CC: Attribution, Commercial Use
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
Etiquette: introductions
to tell one person who another person is and give them a little information about that person (such as their job, where they live) when these people meet for the first time.