Believer
Morrish Bible Dictionary [1]
This word occurs but twice in the A.V.
1. πιστεύω, 'to believe,' from πίστις, 'faith,' Acts 5:14 : "Believers were the more added to the Lord." The same Greek word is constantly used for those that believe on the Lord Jesus Christ to the saving of their souls, as in John 3:15-18 .
2. πιστός, 'trusting, trusty,' also from πίστις, 'faith,' 1 Timothy 4:12; "be thou an example of the believers" The same word is used for "What part hath he that believeth with an infidel, or unbeliever?" 2 Corinthians 6:15 . 'Believers' are a class of persons, who, through the mercy of God, have faith in Christ as the Son of God, and in His atoning work on the cross. See Faith .
Webster's Dictionary [2]
(1): (n.) One who gives credit to the truth of the Scriptures, as a revelation from God; a Christian; - in a more restricted sense, one who receives Christ as his Savior, and accepts the way of salvation unfolded in the gospel.
(2): (n.) One who was admitted to all the rights of divine worship and instructed in all the mysteries of the Christian religion, in distinction from a catechumen, or one yet under instruction.
(3): (n.) One who believes; one who is persuaded of the truth or reality of some doctrine, person, or thing.