οὖν

Etymology
According to Beekes, (2010) "the relation between οὖν and ὦν is unclear. Unconvincing explanations in Brugmann-Thumb 1913: 633 and in Schwyzer 1950: 586f. On οὖν in Homer, cf. Reynen Glotta 36 (1957): Iff. and Reynen Glotta 37 (1958): 67ff."

Particle

 * 1) then
 * 2) therefore
 * 3) Marker of the continuation of a previously interrupted line of thought: "As I was saying..."
 * : whoever, whatever; whosoever