California Teacher Credentialing Examination (CSET) Practice Test 2026 - Free CSET Practice Questions and Study Guide

An affix is defined as a bound morpheme that is attached to a root or base word to modify its meaning or create a new word. Affixes can be prefixes, which are added to the beginning of a word, or suffixes, which are added to the end. This addition can change the word’s tense, grammatical function, or even its part of speech. For example, adding the prefix "un-" to the word "happy" forms "unhappy," which alters the meaning to its opposite.

The context around the other options clarifies their nature: a standalone word is a complete word that does not require other elements to convey meaning, hence it does not fit the definition of an affix. A type of reading strategy does not relate directly to morphology or word formation. Similarly, while root words are essential components in word formation, they are distinct from affixes; root words provide the base meaning to which an affix can be attached.