mem·o·ran·dum 
/ˌmɛməˈrændəm/ noun
plural mem·o·ran·dums or mem·o·ran·da /ˌmɛməˈrændəm/ noun /-də/ [count] 1 : a usually brief written message or report from one person or department in a company or organization to another
▪ The company president sent a memorandum [=(less formally) memo] to each employee. 2 law : an informal written record of an agreement that has not yet become official
▪ The company president sent a memorandum [=(less formally) memo] to each employee.
