GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Is (?), v. i. [AS. is; akin to G. & Goth. ist, L. est, Gr. , Skr. asti. √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.
   
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   ☞ In some varieties of the Northern dialect of Old English, is was used for all persons of the singular.
   
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   For thy is I come, and eke Alain. Chaucer.
   
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   Aye is thou merry. Chaucer.
   
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   ☞ 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.
   
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   To-morrow is the new moon. 1 Sam. xx. 5.