Webster's Revised Unabridged Dictionary · 1913

Imagine

Imagine , transitive verb

[French imaginer, Latin imaginari, p. p. imaginatus, from imago image. See Image.]

1.
To form in the mind a notion or idea of; to form a mental image of; to conceive; to produce by the imagination.
In the night, imagining some fear, How easy is a bush supposed a bear! — Shakespeare
2.
To contrive in purpose; to scheme; to devise; to compass; to purpose. See Compass, transitive verb, 5.
How long will ye imagine mischief against a man? — Bible (KJV) - Psalm lxii. 3
3.
To represent to one's self; to think; to believe. — Shakespeare

Imagine , intransitive verb

1.
To form images or conceptions; to conceive; to devise.
2.
To think; to suppose.
My sister is not so defenseless left As you imagine. — Milton