the largest possible quantity
"The speed limit on this highway is a maximum of 65 miles per hour."
the point on a curve where the tangent changes from positive on the left to negative on the right
"The calculus professor sketched a parabola and pointed out that the peak represents the maximum, illustrating exactly how the slope transitions from rising to falling at that precise spot."
The highest limit
"The speedometer showed that sixty miles per hour was the maximum allowed on this stretch of highway."
In plain English: The maximum is the highest possible amount or limit of something.
"The speed limit has a maximum of sixty miles per hour on this road."
Usage: Use "maximum" as a noun to refer to the greatest possible amount or degree of something within a specific limit. It functions as a standalone subject or object in a sentence, such as "The maximum for this test is ten points."
To the highest degree.
"The storm was at its maximum intensity just before midnight, leaving entire neighborhoods without power."
In plain English: Maximum means the greatest possible amount or highest level of something.
"The speed limit is set to the maximum of sixty miles per hour."
Usage: Use "maximum" to describe the greatest possible amount or intensity allowed by a limit, such as in "maximum speed." It functions as an adjective directly before a noun to indicate reaching the highest level.
The word comes from French, which borrowed it from Latin. In its original form, maximum meant the greatest or largest possible amount.