Webster's Revised Unabridged Dictionary · 1913

Directly

Directly , adverb

1.
In a direct manner; in a straight line or course.
To run directly on. — Shakespeare
Indirectly and directly too Thou hast contrived against the very life Of the defendant. — Shakespeare
2.
In a straightforward way; without anything intervening; not by secondary, but by direct, means.
3.
Without circumlocution or ambiguity; absolutely; in express terms.
No man hath hitherto been so impious as plainly and directly to condemn prayer. — Hooker
4.
Exactly; just.
Stand you directly in Antonius' way. — Shakespeare
5.
Straightforwardly; honestly.
I have dealt most directly in thy affair. — Shakespeare
6.
Manifestly; openly. [Obsolete]
Desdemona is directly in love with him. — Shakespeare
7.
Straightway; next in order; without delay; immediately.
Will she go now to bed?' {not transcribed}Directly.' — Shakespeare
8.
Immediately after; as soon as.
Directly he stopped, the coffin was removed. — Dickens

This use of the word is common in England, especially in colloquial speech, but it can hardly be regarded as a well-sanctioned or desirable use.

Collocations (1)
Directly proportional (Mathematics) , proportional in the order of the terms; increasing or decreasing together, and with a constant ratio; -- opposed to inversely proportional.