A circular is essentially a letter containing some important information that is distributed to a large number of people. ... Be it for inter-departmental communication, advertising or even personal reasons a circular must always reach a large number of correspondents. This is one of its main features.

Why is it called a circular?

A: A leaflet or newspaper insert is called a “circular” because it was originally intended to circulate—to make the rounds among a circle of people. The noun was born in the early 19th century as an abbreviated form of a much earlier phrase, “circular letter,” according to the Oxford English Dictionary.

What do you mean circular?

1a : having the form of a circle : round a circular orbit. b : moving in or describing a circle or spiral a circular staircase. 2a : of or relating to a circle or its mathematical properties a circular arc. b : having a circular base or bases a circular cylinder.