Is

Is Is, v. i. [AS. is; akin to G. & Goth. ist, L. est, Gr. ?, Skr. asti. [root]9. Cf. {Am}, {Entity}, {Essence}, {Absent}.] The third person singular of the substantive verb be, in the indicative mood, present tense; as, he is; he is a man. See {Be}. [1913 Webster]

Note: In some varieties of the Northern dialect of Old English, is was used for all persons of the singular. [1913 Webster]

For thy is I come, and eke Alain. --Chaucer. [1913 Webster]

Aye is thou merry. --Chaucer. [1913 Webster]

Note: The idiom of using the present for future events sure to happen is a relic of Old English in which the present and future had the same form; as, this year Christmas is on Friday. [1913 Webster]

To-morrow is the new moon. --1 Sam. xx. 5.