Definition of "twice"

I've done with my tirade. The world was gone; / The twice two thousand, for whom earth was made, / Were vanish'd to be what they call alone

1824, Lord Byron, “Canto the Thirteenth”, in Don Juan

He could not be induced to remain permanently at Mohair because Miss Trevor was at Asquith, but he appropriated a Hempstead cart from the Mohair stables and made the trip sometimes twice in a day.

1897 December (indicated as 1898), Winston Churchill, chapter V, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd.

Santa Claus is coming to town / He’s making a list, / And checking it twice, / He’s gonna find out who’s naughty or nice / Santa Claus is coming to town

1934, J. Fred Coots, Haven Gillespie (lyrics and music), “Santa Claus Is Coming to Town”

Thus it appears that if the machine is turning twice as slow as before, there is more than twice the former quantity in the rising buckets; and more will be raised in a minute by the same expenditure of power.

1826, John Nicholson, The Operative Mechanic, and British Machinist: Being a Practical Display of the Manufactories and Mechanical Arts of the United Kingdom, volume 1, H.C. Carey & I. Lea, page 78

You can't get anything thinner than a spring shad, unless you take a couple of them, when, of course, they will be twice as thin.

1896, Livingston Stone, Domesticated Trout: How to Breed and Grow Them, 4th edition, page 304

MARY: As you go from left to right, each example has twice as many twos; from right to left, twice as few.

1952, Peter Lincoln Spencer, Building mathematical concepts in the elementary school, page 139

Both men and women with higher qualifications were twice as less likely to be unemployed than their less qualified counterparts.

1995, Louise Corti, Heather Laurie, Shirley Dex, Highly Qualified Women, Great Britain. Dept. of Employment, page 18