sixth /sɪksθ/adjective 1noun 3verb 1forms 3phrases 1 adjective1 •coming as number 6 in a list or seriesAnd * God saw euery thing that hee had made : and behold, it was very good. And the euening and the moꝛning were the sixth day. — 1611 noun3 •The person or thing in the sixth position. •One of six equal parts of a whole.On the moon, however the weight of a pound-mass (lb or lbm) is only about one sixth of a pound-force (lbf). — 2000 •The interval between one note and another, five notes higher in the scale; for example C to A, a major sixth, or C to A flat, a minor sixth. verb1 •(informal, nonstandard) To divide by six, equivalent to multiplying a denominator by six.Why would anyone use sixthing when any (N − a²) divisible by 6 would also be divisible by 3? The answer is that sometimes the numerator and/or the denominator is simpler in sixthing, — 1993 formssixthed · sixthing · sixths Phrases with sixth sixth-rateOf a Royal Navy warship in the Napoleonic Era: having 20–28 guns on one gun deck, a complement of 140–200, and weighing 340–550 tons burthen.