1. snap-in - Noun
2. snap-in - Verb
snap in (third-person singular simple present snaps in, present participle snapping in, simple past and past participle snapped in)
(US, military) To practice aiming, adjusting and firing a rifle with no ammunition
snap-in (plural snap-ins)
(computing, Microsoft Windows) A plug-in.
snap in
The default schema for group membership complies with RFC 2307bis (proposed). citation Windows Server 2003 R2 includes a Microsoft Management Console snap-in that creates and edits the attributes. Source: Internet
These can be either standalone (with one function), or an extension (adding functions to an existing snap-in). Source: Internet