Quick Answer. RPM is the acronym used for revolutions per minute. It measures the number of revolutions completed in one minute around a fixed axis, giving the speed of a mechanical component. It is commonly used to describe the performance of automobile engines.
Definition. A participial phrase is a word group consisting of a present participle (also known as an-ing form) or past participle (also known as an-en form), plus any modifiers, objects, and complements. A participial phrase commonly functions as an adjective.See Examples and Observations below.efinition. A participial phrase is a word group consisting of a present participle (also known as an-ing form) or past participle (also known as an-en form), plus any modifiers, objects, and complements. A participial phrase commonly functions as an adjective. See Examples and Observations below.
There are two participles: The present participle and the past participle. They can both be used as adjectives. Present participle. The present participle is formed by adding  -ing  to the base form of a verb. It is used in: 1  Continuous or Progressive verb forms. 2  I'm leaving in five minutes.here are two participles: The present participle and the past participle. They can both be used as adjectives. Present participle. The present participle is formed by adding  -ing  to the base form of a verb. It is used in: 1  Continuous or Progressive verb forms. 2  I'm leaving in five minutes.