noun
Military term for a small detachment stationed ahead of the main force to provide early warning or reconnaissance. Also used figuratively for a forward position in any field.
敵の前哨部隊が丘の上に陣取っていた。
The enemy's advance guard had taken up position on the hill.
その研究所は宇宙開発の前哨
The research facility functions as an outpost for space exploration.