This root form (lemma) is used in 2 different forms in the NT: στρατιᾶς (GFS), στρατιᾷ (DFS).
It is glossed in 2 different ways: ‘of the army’, ‘army’.
OET LUKE 2:13 Greek word=στρατιᾶς (stratias) Morphology=GFS English gloss=‘of the army’ SR GNT LUKE 2:13 word 8
OET ACTS 7:42 Greek word=στρατιᾷ (stratia) Morphology=DFS English gloss=‘army’ SR GNT ACTS 7:42 word 11