without anyone or anything intervening
"these two factors are directly related"
"he was directly responsible"
"measured the physical properties directly"
without delay or hesitation; with no time intervening
"he answered immediately"
"found an answer straightaway"
"an official accused of dishonesty should be suspended forthwith"
"Come here now!"
In a direct manner; in a straight line or course.
"She drove directly from her office to the airport without stopping at any other locations."
In plain English: Directly means happening right now without anything else getting in the way.
"I will meet you directly after class so we can talk quickly."
Usage: Use directly to describe an action performed without any intermediaries, such as speaking directly to someone. It also indicates physical alignment where one object lies on a straight line with another.
As soon as; immediately (elliptical for directly that/as/when)
"Directly I saw him, I called out to warn him about the wet floor."
The word directly is formed by adding the suffix -ly to direct. It entered English as an adverbial form of the adjective meaning straight or immediate.