Find out the word that conveys the given meaning : To make more rapid in speed

Step-by-Step Explanation
To identify the correct word for the phrase "To make more rapid in speed," we analyze the definitions of the options:

Analyze the phrase: The phrase describes the act of increasing velocity or causing something to move faster.

Evaluate the options:

Speedier: This is an adjective (the comparative form of "speedy") used to describe something that is faster, not the act of making something faster.

Accelerate: This is a verb that specifically means to increase the speed of an object or process. This directly matches the provided definition.

Affianced: This term means to be betrothed or engaged to be married. It is completely unrelated to speed.

Abdicate: This means to renounce or relinquish a throne, high office, or responsibility.