D defs.my
Entry 3 senses Webster, 1913

Believer

/bəl-ēv'-ẽr/ · Be·liev·er · IPA /bɪˈlivɚ/
01 n. One who believes; one who is persuaded of the truth or reality of some doctrine, person, or thing.
  1. 1.
    One who believes; one who is persuaded of the truth or reality of some doctrine, person, or thing.
  2. 2.
    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.(Theol.)
    “Thou didst open the Kingdom of Heaven to all believers.” — Book of Com. Prayer.
  3. 3.
    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.(Eccl. Hist.)