The prefix trans- means across, beyond, or through. It shows up in hundreds of English words, often carrying this sense of crossing from one side to another or moving beyond boundaries.

When you look at a transparent window, light passes through it so clearly you can see what's on the other side. A transcontinental railroad crosses across an entire continent. When ideas transfer from your teacher's mind to yours, they move across the space between you.

The prefix appears in everyday words and specialized ones alike. Transportation moves people or things across distances. Translate means to carry meaning across from one language to another. Transform means to change so completely that you go beyond your original form, like a caterpillar becoming a butterfly.

In science, you'll see trans- in words like transmit (send across) and transplant (move from one place to another).

Once you recognize trans-, you can often figure out unfamiliar words. If someone mentions a transatlantic flight, you know it crosses the Atlantic Ocean. Understanding this little prefix unlocks the meaning of countless words.