i.  oida = to know (intuitively) without effort, to understand. No. i is subjective, while No. ii is objective.

 ii.  ginosko = to know (by experience, or effort); to acquire knowledge, become acquainted with; hence, to come or get to know, learn, perceive. See John 1:48. 1John 5:20. Ephesians 5:5.

 iii.  epi-ginosko. No. ii with epi = upon (Appendix 104. ix); to know thereupon, to become thoroughly acquainted with; to know thoroughly and accurately, recognize. See 1Corinthians 13:12.

 iv.  pro-ginosko. No. ii with pro (Appendix 104. xiv) = to get to know beforehand, to foreknow.

 v.  epistamai = to obtain, and thus have a knowledge of anything by proximity to it, or as the result of prolonged attention; in contrast with the process of getting to know it, or with a mere casual, dilettante acquaintance with it. See Acts 15:7; 18:25; and see note on 19:15.

II.  The Noun.

 i.  gnosis = knowledge acquired by learning, effort, or experience. The result of No. ii, above.

 ii.  epignosis = precise or further knowledge, thorough acquaintance with; true knowledge.

 iii.  sunesis = native insight, understanding, capacity to apprehend; used of reflective thought, while sophia (wisdom) is used of productive thought.