John Moniz Falcao, 81, a retired Central Intelligence Agency linguist who also had worked for the Defense and State departments, died Sept. 16 at his home in Silver Spring after a heart attack.

Mr. Falcao was born in Fall River, Mass., and graduated from St. Mary's Seminary in Baltimore. He worked for the State Department before serving in the Army in postwar Austria as an interpreter. He left the service as a first lieutenant in 1954.

After Austria, he taught English to foreign military officers in Brazil. In the 1960s, he worked for the Bureau of Naval Personnel, and in the 1970s to early 1980s, he was an escort-interpreter for the State Department. He worked for the CIA from the 1970s until retiring in 1995.

Mr. Falcao was a member of St. John the Evangelist Catholic Church and the Knights of Columbus Rosensteel Council No. 2619, both in Silver Spring. He also belonged to the auxiliary of the Legion of Mary at St. John.

Survivors include his wife of 54 years, Phyllis, of Silver Spring; nine daughters, Maria Wilson of Safety Harbor, Fla., Joan Falcao of Gaithersburg, Pat Falcao of Needham, Mass., Betty Falcao of Ithaca, N.Y., Terri Bernaz of Madison, N.J., Carol Young of Clarksville, Ronnie Falcao of Mountain View, Calif., Linda Falcao of Wynnewood, Pa., and Gloria Dodd of Silver Spring; a stepbrother; and 18 grandchildren.