Classify the Following Definition According to Its Use: to Reduce

Short Answer

Classify the following definition according to its use: to reduce vagueness, to introduce or explain a new or unusual word, to evoke an attitude about something, or to accomplish some other purpose.
The "HO" in "HO gauge" stands for "half-O," which refers to an older scale for model trains. HO gauge is one-half the scale of O-gauge, or one-sixty-fourth of full size.