Noah Webster's Dictionary (v. i.) To maintain a purpose in spite of opposition or discouragement; not to give or abandon what is undertaken.

Multi-Version Concordance Persevere (3 Occurrences) Philippians 3:16 But whatever be the point that we have already reached, let us persevere in the same course. (WEY) Colossians 4:2 Persevere in prayer, watching in it with thanksgiving; (DBY) 1 Timothy 4:16 Be on your guard as to yourself and your teaching. Persevere in these things; for by doing this you will make certain your own salvation and that of your hearers. (WEY NAS NIV)