fourteenth UK /ˌfɔːˈtiːnθ/US /ˌfɔɹˈtiːnθ/noun 3adjective 1forms 1 noun3 •The person or thing in the fourteenth position. •One of fourteen equal parts of a whole. •The interval comprising an octave and a seventh. adjective1 •The ordinal form of the number fourteen. formsfourteenths