teater.

Borrowed via German Theater and French théâtre, ultimately from Latin theātrum, from Ancient Greek θέᾱτρον (théātron) (see there for more). During the 17th century, when this word first appeared in Swedish, its most immediate derivation appears to have been from German, with influence from the French equivalent increasing later on; most other theatric terms in Swedish derive from French as well. From its earliest attestations up to 1689, the word originally had neuter gender (evidenced by e.g. the definite singular form theatret in 1658), as it still does in German, Danish, and Norwegian. The common gender is attested since 1671, and is used regularly since the 18th century.