Definition of "sure"

The Celebrity, by arts unknown, induced Mrs. Judge Short and two other ladies to call at Mohair on a certain afternoon when Mr. Cooke was trying a trotter on the track. The three returned wondering and charmed with Mrs. Cooke; they were sure she had had no hand in the furnishing of that atrocious house.

1897 December (indicated as 1898), Winston Churchill, chapter IV, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd., page 58

Roy: I'm 95% sure it was him.Jen: You... you said you were 99% sure.Roy: I'm 97% sure it was him.

2008 November 21, Graham Linehan, The IT Crowd, Season 3, Episode 1

Feare not: the Forreſt is not three leagues off, / If we recouer that, we are ſure enough.

c. 1590–1591 (date written), William Shakespeare, “The Two Gentlemen of Verona”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene i], page 36, column 1

The king was sure to Dame Elizabeth Lucy, and her husband before God.

c. 1513-1518 (probably date written, published after 1535) Thomas More, History of King Richard III

I presum'd […] [that] you had been sure, as fast as faith could bind you, man and wife.

1632, Richard Brome, The Northern Lass

These high and gusty relishes of life, sure,Have no allayings of mortality in them.

1802, Charles Lamb, John Woodvil

Theſe are the wings ſhall make it flie as ſwift,As dooth the lightening: or the breath of heauen,And kill as ſure as it ſwiftly flies.

c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, Act II, scene iii