Definition of "fourth"

The fourth model is called the enlightment model: Actors are seen to be responsible for problems but unable or unwilling to provide solutions. They are believed to need discipline provided by authoritative guidance. The Alcoholic Anonymous[sic] groups are considered prototypical for this model.

2013 June 29, Leo Montada, “Coping with Life Stress”, in Herman Steensma, Riël Vermunt, editors, Social Justice in Human Relations Volume 2: Societal and Psychological Consequences of Justice and Injustice‎, Springer Science & Business Media, page 26

We are one F and two M's seeking the company of a fourth (M or F) for our spacious and friendly Somerville apt.

1978 April 8, “Classified advertisement”, in Gay Community News, page 14

Now I've heard there was a secret chord / That David played, and it pleased the Lord / But you don't really care for music, do ya? / It goes like this, the fourth, the fifth

1984, Leonard Cohen (lyrics and music), “Hallelujah”, in Various Positions

If he remembered rightly what took place in the House on the first night of the session, the Attorney General would have to file an information, not only against the noble Lord who proposed the address, and the hon. Member for London who seconded it, but also against the hon. Member who thirded, and the noble Lord who fourthed it, and indeed against every Member in the House.

1830 March 2, Hansard’s Parliamentary Debates, volume XXII, London, page 1189

A lisping young “Soundings,” or master’s assistant, sung out “I thecond the mothon,” instantly transferring his beer to our hero’s face. In short the resolution was thirded, fourthed, fifthed, and sixthed, all following suit with the swipes: […]

1854 January, “Tregonhorke’s First Trip in a Man-of-War”, in Hunt’s Yachting Magazine, volume the third, London: Hunt and Son, […]; Simpkin, Marshall, & Co., […], page 14

It was then moved, seconded, thirded, fourthed, and fifthed, “that Jarman be, and is hereby hung, and ought to be kicked.”

1892 December 31, Talbot Baines Reed, “Tom, Dick, and Harry. A School Story.”, in The Boy’s Own Paper, volume XV, number 729, page 212, column 2