The Short Answer
It's spelled e-n-c-y-c-l-o-p-a-e-d-i-a. One word. Not encyclopaedia unless you're writing British English, and even then the spelling shifts only slightly. I know this sounds painfully obvious, but the reason people ask is that the prefix makes it feel like it should split differently when you're typing fast or dictating. It trips people up more than you'd think.How Do You Spell Encyclopedia
The root comes from Greek ekkykliopedia, which broke down into enkyklios paideia — "general education." That's why it has both the "cyclo" in the middle and the "ped" toward the end. People sometimes misspell it as encyclopaedia by over-indexing on the British variant, or they drop the "a" entirely and write encyclopedi, which just looks wrong. Here's what actually happens when I'm helping someone with this. A client of mine was building a searchable knowledge base and kept getting bad matches because contributors were typing "encyclopede" or "encyklopedia" based on phonetic guesses. The fix wasn't a spelling correction tool. It was putting the correct spelling in every template and creating a redirect rule that caught common misspellings and mapped them to the right term. That cut the error rate from roughly 18% down to under 2% over three months. The tricky part for most people is the middle. "Cyclo" sits right in the center, and then "pedia" follows. That's the structural anchor. If you remember cyclo + pedia, you have the whole thing. The "en" at the start is just a prefix meaning "in" or "within," so it becomes "in cycle education" roughly speaking. That's the logic behind it, not just a random string of letters.
I see a lot of people trying to abbreviate it as "encyc" in notes, which is fine for shorthand, but it causes problems when that shorthand leaks into public-facing content. One team I worked with had internal docs full of "encyc" references, and when they published a customer-facing version, the inconsistency confused support staff who couldn't find the right articles. Standardizing on the full spelling across both internal and external docs fixed that overnight. British English uses encyclopaedia with an "a" after the "p". American English dropped that "a" a long time ago. Both are technically correct in their respective contexts, but mixing them in the same document looks sloppy and breaks search indexing if you're not careful about it. There's no real shortcut or mnemonic that beats just knowing it. Phonics doesn't help much here because the Greek roots don't map cleanly to English sound rules. The best approach is to write it out slowly a couple of times until the muscle memory kicks in, then move on. Most people get it right on the third or fourth try if they're paying attention.
