Write a part (two words) when you mean a piece of something or belonging to it: “I’m thrilled to be a part of the design team.” Write apart (one word) when you mean separated, at a distance, or in pieces: “My brothers live 3,000 miles apart.”
The difference between apart and a part is a single space. The meanings point in opposite directions, though: one joins you to something, and the other pulls you away from it.
Apart and A Part, Side By Side
| a part | apart | |
| Form | Two words | One word |
| Word type | “a” (a little word like a or the) plus “part” (a noun, the name of a thing) | Usually an adverb (a word that tells where, how, or how far) |
| Meaning | A piece, a member, a role, a component | Separated, at a distance, into pieces |
| Usual partner | of: a part of | from, or a distance in front: apart from, 50 minutes apart |
| Example | The battery is a part you can replace yourself. | Our connecting flights are only 50 minutes apart. |
When You Can Drop The “A” From “A Part”
Before of, the “a” is usually optional. “Physical therapy is a part of recovery” and “Physical therapy is part of recovery” both work.
Some teachers say the two versions carry slightly different shades of meaning. Sources don’t agree on what that shade is, so treat them as the same in everyday writing.
The “a” has to stay in two cases:
- A describing word sits in front of “part”: “Lab safety training is a big part of first-year chemistry.”
- “Part” means an object or a role: “The mechanic ordered a part from the dealer.”
That second example is worth a look. It’s two words even though from follows it, so the “of means a part, from means apart” shortcut won’t always save you.
Distance, Separation and Pieces: What “Apart” Means
“Apart” does three main jobs:
- Distance in space or time: “The two teams are four points apart going into the final week.”
- Separation: “We spent the holidays apart for the first time.”
- Into pieces: “The laptop came apart when I removed the third screw.”
It can also follow a noun to set that thing aside: “Cost apart, the electric model wins on every measure.”
What it can’t do is sit in front of a noun. Collins English Usage warns against that. So “a world apart” is fine, but “an apart room” is not.
“Apart From” Can Mean “Except” or “Plus”
Most guides give “apart from” one line. It deserves more, because it has two meanings that pull in opposite directions:
- Except: “Everyone signed the form apart from Dev.” Dev didn’t sign.
- In addition to: “Apart from the entry fee, you’ll also pay for parking.” You pay both.
The Oxford Learner’s Dictionaries list both meanings. Linguists have found the same double meaning in Russian, Turkish, Hindi and other languages, so this isn’t an English quirk.
Usually the rest of the sentence tells your reader which meaning you want. Look for these clues:
| If the sentence has… | “Apart from” usually means… | Example |
| all, every, everyone, no one, nothing | except | Nothing in the fridge was fresh apart from the milk. |
| also, other, too, as well | in addition to | Apart from the cost, there are two other problems. |
| none of these clues | could be either | Apart from Spanish, Maya teaches two classes. |
That last sentence is the risky one, because you can’t tell whether Maya teaches Spanish. Rewrite it so only one reading is possible:
- “Maya teaches Spanish and two other classes.”
- “Maya teaches two classes, and neither one is Spanish.”
In contracts, policies, and instructions, skip “apart from” and write except or in addition to. Each of those has only one meaning.
One fixed rule applies either way. Collins notes that this “apart” must be followed by from and no other preposition.
Using “Aside From” for American Readers
Oxford and Collins both point out that American writers often use aside from instead. Oxford gives it the same two meanings.
“Aside from the rain, the trip was great” is the more typical US choice. “Apart from the rain” is still correct.
The same split shows up in a common idiom. British speakers say “joking apart,” while “joking aside” works in both Britain and North America.
Why “Apart Of” Keeps Showing Up in Posts
The error lives mostly in quick, unedited writing like texts, social posts, and LinkedIn announcements. “Happy to be apart of the team!” literally says you’re glad to be separated from your new team.
Edited writing rarely makes the slip. Usage writer Jeremy Butterfield checked the 2014 Oxford Corpus, a huge collection of real English text:
- “a part of” appeared 55,198 times
- “apart of” appeared 635 times, about 1 for every 87
Published books tell a similar story. In Google Books data from 1900 to 2019, “apart of” turns up roughly once for every 100 to 200 uses of “a part of.” Ngram counts every matching string, so treat those as rough figures.
Butterfield also found that “apart” is the more common spelling overall, with 148,655 uses against 71,253 for “a part.” His guess is that when two forms sound alike, people type the one their fingers know best. He admits that’s hard to prove, but it fits the numbers.
Here’s a check you can do in a second: slip a describing word into the gap.
- “I’m proud to be a key part of this project.” That makes sense, so you need a part.
- “We live a key part.” That’s nonsense, so you need apart.
Where “Apart” Carries Legal and Medical Weight
In US family law, “living separate and apart” is a set phrase. The California Supreme Court called it a term of art (a phrase with a fixed meaning in a field). It ruled that spouses had to live in separate homes for their earnings to count as separate property.
Health instructions lean on the word, too. The Levoxyl patient information tells patients to take this thyroid medicine at least 4 hours before or after medicines containing calcium carbonate or iron.
In plain terms, you’d write: “Take your thyroid pill and your calcium supplement at least four hours apart.” For your own medicines, follow the label and ask your pharmacist.
“Apart” Started Out as Two Words
The confusion has old roots. According to Etymonline, “apart” entered English in the late 1300s from Old French a part, meaning “to the side.”
English speakers probably heard that “a” as the same prefix found in ahead and abroad. Those are single words, and so is “apart.”
What’s The Opposite of “Apart”?
For the main meaning, it’s together: “We spent the holidays together.” For “apart from” in its “except” sense, the opposite is including: “Everyone signed the form, including Dev.”
When you’re writing about belonging, joining, or a single piece, keep the space and write “a part.” When things are separate, far off, or in pieces, close it up as “apart.” If “apart from” could be read two ways, swap in “except” or “in addition to” and the problem disappears.
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I’m Hazel, and I studied BSC English at GCUF. I focus on explaining word meanings in simple, clear language that anyone can understand. My goal is helping readers grasp everyday English, confusing terms, and slang used in real conversations and social media. I believe language learning works best when definitions connect to actual life situations. Through careful research and straightforward explanations, I make vocabulary accessible for students, learners, and anyone curious about how English really works in daily use.