Strong's G1242 — διαθήκη (noun)
diatheke (dee-ath-ay'-kay) n.
1. (properly) a disposition
2. (specially) a contract (especially a devisory will)
[from G1303]
KJV: covenant, testament 
Root(s): G1303 
Hebrew root: διατίθεμαι
Occurrences: 33