From a compound of ek and a derivative of kaleo; a calling out, i.e. (concretely) a popular meeting, especially a religious congregation (Jewish synagogue, or Christian community of members on earth or saints in heaven or both) -- assembly, church.
see GREEK ek
see GREEK kaleo
ἐκκλησίᾳ (ekklēsia) − 33 Occurrences
ἐκκλησίαι (ekklēsiai) − 7 Occurrences
ἐκκλησίαις (ekklēsiais) − 18 Occurrences
ἐκκλησίαν (ekklēsian) − 20 Occurrences
ἐκκλησίας (ekklēsias) − 29 Occurrences
ἐκκλησιῶν (ekklēsiōn) − 7 Occurrences