Use prefixes, suffixes, or roots to infer meaning.

Have you ever looked at a long, unfamiliar word and thought, "I have no idea what that means"? You're not alone. English has over a million words, and nobody knows all of them. The good news is that most English words are built from smaller pieces that come from older languages. If you learn those pieces, you can figure out words you've never seen before.

English is like a giant recipe. It borrows ingredients from Latin, Greek, Old English, French, and many other languages. Over centuries, these ingredients mixed together to form the words we use every day. Understanding where the pieces come from gives you a superpower on the ISEE.

Here's the big question: on the ISEE, you'll see words you've never studied. How can you figure out what they mean without a dictionary? The answer is to break them apart. If you know the meaning of the small pieces, you can put the meaning together like a puzzle.

Every word you can break apart has up to three types of pieces. Think of these like building blocks that snap together. Once you know what each block means, the whole word starts to make sense.

On the ISEE, this skill is especially useful for Synonym questions. When you see a capitalized word you don't recognize, look for a prefix, root, or suffix you know. Even one familiar piece can help you eliminate wrong answers and zero in on the right one.

Let's see how this works with a real word. The diagram below breaks the word "incredible" into its three parts. Notice how each part adds a layer of meaning.

Notice something powerful here: even if you didn't know the word "incredible," you could figure it out. The root "cred" appears in words like "credit" (trust), "credible" (believable), and "credentials" (proof of trustworthiness). Once you learn one root, you can unlock a whole family of words.

When you see an unfamiliar word on the ISEE, follow this three-step process. It works for both Synonym and Sentence Completion questions.

Let's see this process in action. Suppose you see the word BENEVOLENT on a Synonym question. You might recognize "bene-" from "benefit" — it means "good" or "well." You might also notice "vol" looks like "volunteer" — it relates to "will" or "wanting." So "benevolent" means something like "wanting good" or "well-wishing." That points you toward a word like "kind" or "generous."

You don't need to memorize hundreds of word parts. Learning the most common ones will help you with a huge number of ISEE words. Here are the word parts that show up most often.

High-Frequency Prefixes

High-Frequency Roots

Let's walk through a full ISEE-style Synonym question using our word-parts strategy. We'll take it step by step so you can see exactly how to think through it.

Word parts are incredibly useful, but you need to watch out for a few tricky situations. Let's look at the biggest strengths and potential traps of this strategy.

Word parts don't just help with Synonym questions. They're also useful for Sentence Completion questions. On the ISEE, Sentence Completions give you a sentence with one blank. You need to pick the word that best completes the sentence. If one of the answer choices is unfamiliar, breaking it into parts can help you decide if it fits.

As you continue preparing for the ISEE, building your knowledge of word parts will also help you with the Reading Comprehension section. When you encounter unfamiliar words in passages, the same decoding strategy applies. The more word parts you learn now, the stronger your overall vocabulary becomes — not just for the test, but for school and beyond.

Try these five ISEE-style questions. Use your word-parts knowledge to find the best answer. Remember: look for prefixes, roots, and suffixes you recognize, then eliminate wrong answers.