Lexical Definition

‎προαύλιον‎ proaúlion (pro-ow'-lee-on) entryway ^G:N-N
neuter of a presumed compound of ‎πρό‎ and ‎αὐλή‎

porch.

• a forecourt, i.e. vestibule (alley-way)

Abbott-Smith

* προ-αύλιον, -ου, τό (< πρό, αὐλή),
a porch, vestibule: Mk 14:68.†

Abbott-Smith References

Liddell-Scott-Jones

προαύλιον-ιον, τό,

(αὐλός) prelude on the flute, [Refs 5th c.BC+]

__II αὐλή) place before a court, vestibule, [Refs 2nd c.AD+]
__II.2 space before a cattle-pen, [Refs 2nd c.AD+]