Set Apart Part 1 What does it truly mean?

Read Me..

Psa_4:3  But know that the LORD hath set apart him that is godly for himself: the LORD will hear when I call unto him.

Rev 19:8  And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints. 

Num_6:1-6; Exo_33:16; Lev_20:26;

H5139
נָזִר    נָזִיר
nâzı̂yr    nâzir
naw-zeer', naw-zeer'
From H5144; separate, that is, consecrated (as prince, a Nazirite); hence (figuratively from the latter) an unpruned vine (like an unshorn Nazirite). (The translation, Nazarite, is by a false alliteration with Nazareth.): - Nazarite [by a false alliteration with Nazareth], separate (-d), vine undressed.
Total KJV occurrences: 16

mean?