Strong's G2169 — εὐχαριστία (noun)
eucharistia (yoo-khar-is-tee'-ah) n.
1. gratitude
2. (actively) grateful language (to God, as an act of worship)
[from G2170]
KJV: thankfulness, (giving of) thanks(-giving) 
Root(s): G2170 
Hebrew root: εὐχάριστος
Occurrences: 15