Strong's G2121 — εὔκαιρος (adjective)
eukairos (yoo'-kai-ros) adj.
1. well-timed, i.e. opportune
[from G2095 and G2540]
KJV: convenient, in time of need 
Root(s): G2095, G2540 
Hebrew root: καιρός
Occurrences: 2