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]
" In some varieties of the Northern dialect of Old English, is was used for all persons of the singular."
[1913 Webster]
" 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]
"For thy is I come, and eke Alain."
[1913 Webster]
"Aye is thou merry."
[1913 Webster]
"To-morrow is the new moon."