Lexical Definition

‎περιούσιος‎ perioúsios (per-ee-oo'-see-os) special ^G:A
from the present participle feminine of a compound of 4012 and ‎εἰμί‎

peculiar.

• being beyond usual, i.e. special (one's own)

Abbott-Smith

† περιούσιος, -ον (< περίειμι, to be over and above), [in LXX: Ex 19:5 23:22, De 7:6 14:2 26:18 (סְגֻלָּה, עַם ם׳)*;]
one's own, of one's own possession: λαὸς π. (cf. LXX, Ex 19:5 23:22, De 7:6 14:2 26:18), Tit 2:14.†

Abbott-Smith References

Liddell-Scott-Jones

περιούσιος-ος, ον,

having more than enough, wealthy, [Refs 4th c.AD+]

__II especial, peculiar, λαός [LXX+NT]

_{LSJ Scripture Refs: LXX.Exod.19.5 ☩ Titus.2.14}