twelfth

UK: /ˈtwɛlfθ/ US: /twɛlfθ/ ,(twelfth)

WordReference Random House Learner's Dictionary of American English © 2025

twelfth /twɛlfθ/   adj. 

1. next after the eleventh;
   being the ordinal number for 12.
2. being one of 12 equal parts.

n. [countable]

3. a twelfth part, esp. of one (1&sfracdenom;12&sfracend;).
4. the twelfth member of a series.

WordReference Random House Unabridged Dictionary of American English © 2025

twelfth (twelfth),  adj. 

1. next after the eleventh;
   being the ordinal number for 12.
2. being one of 12 equal parts.

n. 

3. a twelfth part, esp. of one (¹⁄₁₂).
4. the twelfth member of a series.

• Middle English twelfthe, twelfte, Old English twelfta, equivalent. to twelf twelve + -ta -th² bef. 900

Collins Concise English Dictionary © HarperCollins Publishers::

twelfth / twɛlfθ/ adjective

1. (usually prenominal) coming after the eleventh in number or counting order, position, time, etc; being the ordinal number of twelve: often written 12th
2. (as noun): the twelfth of the month

noun

1. one of 12 equal or nearly equal parts of an object, quantity, measurement, etc
2. (as modifier): a twelfth part
3. the fraction equal to one divided by 12 ()
4. an interval of one octave plus a fifth
5. one of two notes constituting such an interval in relation to the other
6. an organ stop sounding a note one octave and a fifth higher than that normally produced by the key depressed