con·gre·gate 
(k
ŏng
gr
ĭ-g
āt
′)
tr. & intr.v. con·gre·gat·ed,
con·gre·gat·ing,
con·gre·gates To bring or come together in a group, crowd, or assembly. See Synonyms at gather.
adj. (-g
ĭt)
Involving a group: congregate living facilities for senior citizens.
[Middle English congregaten, from Latin congregāre, congregāt- : com-, com- + gregāre, to assemble (from grex, greg-, herd; see ger- in the Appendix of Indo-European roots).]
congre·ga′tive adj.
congre·ga′tor n.