What part of speech is decimalize?

Decimalize can be categorized as a verb.

Parts of speech

1. decimalize is a verb, present, 1st person singular of decimalize (infinitive).
2. decimalize is a verb (infinitive).

Verb
decimalize - change to the decimal system; "The country decimalized the currency in 1975"
decimalize - change from fractions to decimals; "Stock prices will be decimalized in the year 2000"