(American football) A common offensive formation, beginning with the usual five offensive linemen (two offensive tackles, two guards, and a center), the quarterback under center, and two backs in-line behind the quarterback. The base variant adds a tight end to one side of the line and two wide receivers, one at each end of the line.

(computing, artificial intelligence) A computer language designed for communicating knowledge between independently running computer programs.

(biology, archaic) The formation of several cells from and in the protoplasm of the mother cell.

(aviation) An aerial salute to commemorate a deceased person, consisting of a formation of flying aircraft with a space where one plane should be flying.

plural of missing man formation

(soccer) A formation consisting of four defenders, three central midfielders, two attacking midfielders, and one striker.

plural of Christmas tree formation

(obsolete, 18th century, US) A country dance, most often specifically a type of New England line dance.