counsel (n.)

c. 1200, "advice or instruction given;" c. 1300, "mutual advising or interchange of opinions, consultation," from Old French counseil "advice, counsel; deliberation, thought" (10c.), from Latin consilium "plan, opinion," from assimilated form of com "with, together" (see con-) + root of calare "to announce, summon" (from PIE root *kele- (2) "to shout"). As a synonym for "lawyer, one who gives legal counsel," attested late 14c.

c. 1300, counseilen, "to give or offer advice, admonish, instruct," from Old French conseiller "to advise, counsel," from Latin consiliari, from consilium "plan, opinion," from assimilated form of com "with, together" (see con-) + root of calare "to announce, summon" (from PIE root *kele- (2) "to shout"). Related: Counseled.