Use the following online study links (or, others sites or books if you prefer) to present a word study of the Greek word translated "citizenship" in Philippians 3:20 (NIV).
New Testament Interlinear
Parsing - 1 Parsing - 2
Lexicon - 1 Lexicon - 2
Word Study (click "lookup by verse" or "lookup by word")
Vincent's Word Study
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