SAT® Vocabulary Tips: Breaking Down Word Roots, Prefixes, and Suffixes

Building a strong vocabulary isn't just about memorizing definitions. Understanding how words are formed can help students recognize unfamiliar terms, improve reading comprehension, and feel more confident when tackling challenging passages.

While the digital SAT® has moved away from testing obscure vocabulary in isolation, strong vocabulary skills still play an important role in the Reading and Writing section. Students are expected to determine the meaning of words based on context, and knowing common word roots, prefixes, and suffixes can make unfamiliar words much easier to understand.

The lists below introduce some of the most common word parts students may encounter. Learning them won't replace reading practice, but they can provide helpful clues when breaking down unfamiliar SAT vocabulary.

Here is a list of common root word definitions that can help you with SAT vocabulary:

• "ambu" means "move"
• "andro" means "man"
• "anthro" means "human"
• "bellu" means "fight"
• "clam" means "shout"
• "clin" means "bend"
• "cred" means "trust"
• "fract" means "break"
• "gnos" means "knowledge"
• "grad" means "to go"
• "greg" means "group"
• "gyn" means "female"
• "her" means "to stick"
• "jac" means "to throw"
• "ject" means "to throw"
• "lum" means "light"
• "meta" means "change"
• "morph" means "shape"
• "narco" means "sleep"
• "oper" means "work"
• "pac" means "calm"
• "plac" means "calm"
• "phon" means "sound"
• "senti" means "emotion" or "feeling"
• "somn" means "sleep"
• "son" means "sound"
• "soph" means "wise"
• "spec" means "look"
• "term" means "end"
• "theo" means "god"
• "ven" means "come"
• "vid" means "to see"
• "voc" means "call"
• "vol" means "will"

Here is a list of common prefix definitions that can help you with SAT vocabulary:

• "A-/An-" means "without"
• "Ab-" means "away"
• "Ad-" means "toward"
• "Anim-" means "mind" or "spirit"
• "Ante-" means "before"
• "Anti-" means "against" or "opposite of"
• "Auc-" means "increase"
• "Aug-" means "increase"
• "Aud-" means "hear"
• "Aur-" means "hear"
• "Auto-" means "self"
• "Ben-" means "good"
• "Bon-" means "good"
• "Circum-" means "around"
• "Co-" means "joint" or "together"
• "Con-" means "with"
• "Contra-" means "against" or "opposite"
• "De-" means "separation" or "negation"
• "Hyper- means "over" or "excess"
• "Hypo-" means "beneath" or "below"
• "Inter-" means "between" or "among"
• "Intra-" means "within" or "inside"
• "Ir-" means "not"
• "Mal-" means "bad" or "wrongful"
• "Post-" means "behind" or "after"
• "Pre-" means "before"
• "Pro-" means "forward movement" or "advancement"
• "Se-" means "apart"
• "Sub-" means "below," "secondary," or "part of"
• "Super-" means "above" or "excess"
• "Syn-" means "with" or "together"
• "Trans-" means "across" or "through"
• "Ultra-" means "beyond" or "on the far side of"
• "Vice-" means "in place of"

Here is a list of common suffix definitions that can help you with SAT vocabulary:

• "-able" means "capable of"
• "-ate" means "make" or "function"
• "-cess" means "move" or "yield"
• "-cede" means "move" or "yield"
• "-cide" means "to kill"
• "-cis" means "shorten"
• "-ette" means "feminine role" or "smaller form"
• "-ist" means "a person related to something"
• "-logy" means "the study of something"
• "-ology" means "the study of something"
• "-ous" means "full of"

Here are some examples of how breaking down a word can help you find the definition for difficult SAT Exam questions. Sometimes, knowing the definition of just one part of the word can help you infer the entire word's meaning.

Advocate

Break down this word, starting with the prefix "ad," which means "toward." The root of this word is "voc," which means "call." The suffix is "ate," which means "make" or "function." "Advocate" can be inferred to mean something or someone who calls function torward.

While this is a jumbled definition of the word, you can use the breakdown to eliminate answer choices. Merriam-Webster defines advocate as "One who defends or maintains a cause or proposal." An advocate might call attention to something similar to our inferred definition.

Contradict

"Contra" means "against." Even knowing one part of the definition, we can eliminate any meanings from the answer choices that do not have to do with "opposition."

Benevolent

The prefix "ben" means "good," and the root "vol" means "will." We can infer that the definition of this word is close to "good-willed."

Malevolent

The prefix "mal" means "bad" or "wrongful," and the root word "vol" means "will." We can infer that the definition of malevolent is close to "bad-willed."