How to Build Vocabulary Through Reading: Insights from Research

No one knows every word in every language—or even every word in their own language, for that matter. An extensive vocabulary isn’t essential for daily living. We only need a few tens of thousands to get by. But this is far more than the few thousand words toddlers gather before entering primary school.

Kids need so much language acquisition in school that even if we made it the only subject, it wouldn't be enough. Thankfully, Nagy, Herman, and Anderson proved with their research that students don’t need to spend all of their time learning new words because they pick them up naturally through context clues.

When children master the majority of school words through context, teachers should turn to books. Why? Because books are one of the best places to discover new words.

Nagy and his colleagues dove into the details of how kids learn new words while reading by creating an experiment that mimics natural reading as closely as possible. They discovered how kids learn new words, including how many times they need to see a word before they’ll remember it, as well as how context and reading can support vocabulary development. Let’s look at what they discovered together.

Key Research Insights: How Context and Reading Improve Vocabulary

In Nagy’s study, a group of 57 students (14 years old) was assigned to read either an instructive book about rivers or a spy story. Each text was around 1,000 words long.

The researchers identified the fifteen most challenging words in each manuscript. To ensure the participants didn’t already know these words, they hid them among a list of approximately 200 words.

Students were asked to check whether they recognised the words or not. After reading, they participated in a discussion and took a multiple-choice test to help them understand the meaning of the thirty terms (of which only fifteen were found in their own book).

Here’s what they found:

• Most students recognised fifteen terms from the book they read, but not the others. The majority of the terms in the book occurred just once, and the pupils only read it once. The context helped them understand and retain the words.
• Even participants with limited vocabularies were able to recognise the terms while reading. And it didn't make a difference if the pupils had read the narrative or informative piece.
• The students couldn’t provide clear meanings for newly learnt vocabulary. Although they didn’t fully comprehend the words, they had a general understanding of their meanings. Nagy and his colleagues explained that the meaning becomes more familiar and deeper with each contact.

What else did we learn from this study?

Reading helps students naturally expand their vocabulary by learning words in context. This is a more effective (and more enjoyable) alternative to rote memorization. Beyond just words, how regular reading boosts intelligence and cognitive abilities is well-documented, as reading forces the brain to process complex information and patterns.

When reading a text, there are more unknown terms than readers can remember. Research by Nagy and colleagues indicates that context-based word learning yields approximately 10% of new vocabulary acquisition. This method of word learning is similar to shooting with a shotgun rather than sharpshooting.

However, learning words through a tale is still efficient. After all, the formation of vocabulary is entirely coincidental. Reading is both a leisure activity and a means of expanding one's knowledge and skills. So it hits many birds with the same stone.

But how much reading is required to learn a substantial number of words? In a 1987 follow-up study, three reading researchers found that pupils who read for fifteen minutes daily would obtain an average of 1,000 new words every year.

Practical Strategies for Vocabulary Instruction in Schools

Nagy and colleagues' findings suggest that schools shouldn’t let go of vocabulary teaching. Direct instruction is still a highly effective method for teaching new words.

To save time, schools should start with school language that students need to grasp instructions, like 'argue', 'determination', 'check', and 'fragment'. This foundational vocabulary is essential because how reading improves writing often depends on a student's ability to use these precise terms to express their ideas clearly.

The three reading scholars also emphasise the importance of reading aloud and independently, in addition to direct instruction. It's crucial to encourage pupils to read books and magazines at school, as they may not do so at home.

Many schools have even implemented free reading schedules, where all classes read for half an hour on a weekly (or daily) basis—teachers included!

Tips for Creating a Language-Rich Classroom Environment

As a teacher, you have several pathways for teaching new vocabulary. In nursery classes, children learn quickly through reading, talking, and playing language activities.

In middle and upper grades, vocabulary classes introduce students to new words and focus on school language words. Learning new words that are unlikely to be used frequently is ineffective, because students may not practise them enough to remember them long-term.

Provide as much free reading as possible. This is not a luxury activity to be done in free moments. It should be prioritised just like any other subject.

Encourage students to engage in daily free reading for 15 to 30 minutes. Discuss with your team how you can apply this school-wide.

Immerse kids in language as often as you can. Read outloud, hold conversations, listen to books, poems, or music, and then talk about them again. Hang book covers on classroom walls, place books on your theme tables, and so on.

Transform your classroom into a language-rich environment to promote vocabulary growth and literacy skills over everything else.

Key take-aways

• Vocabulary instruction alone can only teach so many words. Reading expands children’s language base even more.
• Free reading isn’t just for fun—it deserves a regular spot on the schedule.
• With just fifteen minutes of free reading every day, students gain an average of one thousand new words per year.
• Do what you can to make your classroom a linguistically-rich environment.

Reference Nagy, W. E., Herman, P. A., & Anderson, R. C. (1985). Learning words from context.