Agree  v. (-ees, -eed, -eeing) 1 hold the same opinion (i agree with you). 2 consent (agreed to go). 3 (often foll. By with) a become or be in harmony. B suit (fish didn't agree with him). C gram. Have the same number, gender, case, or person as. 4 reach agreement about (agreed a price). 5 (foll. By on) decide mutually on (agreed on a compromise).  be agreed be of one opinion. [latin: related to *ad-, gratus pleasing]