The state or condition of being inside.

inside, within, inwardly, internally, interiorly, innerly

The quality of being an insider.

In an inside or internal manner; internally.

Inside

The interior or inner part. / The left-hand side of a road if one drives on the left, or right-hand side if one drives on the right.

Of or pertaining to the inner surface, limit or boundary. / Nearer to the interior or centre of something. / Originating from, arranged by, or being someone inside an organisation.

Within or towards the interior of something; within the scope or limits of something (a place), especially a building. / (colloquial) In or to prison. / Indoors.

plural of insider

plural of inside