1: γνωστός
(Strong's #1110 — Adjective — gnostos — gnoce-tos' )

from ginosko, "to know," signifies "known, or knowable;" hence, "one's acquaintance;" it is used in this sense, in the plural, in Luke 2:44; 23:49 . See KNOWN , NOTABLE.

2: ἴδιος
(Strong's #2398 — Adjective — idios — id'-ee-os )

"one's own," is translated "acquaintance" in the AV of Acts 24:23 , "friends" (RV). See COMPANY.