An uncertainty.
"Perhaps I won't make it to the party after all, since my car might break down on the way."
"Perhaps is not always easy to define when used as a noun in formal logic."
Usage: Use "perhaps" only as an adverb to mean "maybe"; do not use it as a noun to describe uncertainty. If you need a noun form for that meaning, use the word "possibility."
Modifies a verb, indicating a lack of certainty.
"Perhaps we should reschedule our meeting for next week since I'm not entirely sure about my availability."
In plain English: Perhaps means you are not sure if something is true or will happen.
"Perhaps we should leave early to avoid the traffic."
Usage: Use perhaps to modify a verb or entire clause when expressing uncertainty about whether something will happen or is true. Place it before the word it modifies or at the beginning of a sentence to soften a statement.
Perhaps comes from the Middle English word perhap, which is formed by combining "per" with "hap," meaning chance or coincidence. The term originally suggested that something might happen purely by luck before evolving into its modern usage in English.