Not only are the terms stationary and stationery homophones, words that sound the same, they are also nearly identical in spelling. One is spelled with an “a” while the other is spelled with an “e”. This often causes confusion among English writers. However, that single letter difference actually makes them worlds apart in terms of their meanings.
The word stationary is an adjective used to mean “not moving or not intended to be moved.” You might be familiar with a stationary bike, a bicycle which you can pedal all you want but you would not reach any destination.
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On the other hand, the term stationery is a noun used to refer to “writing and other office materials.”
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Sometimes, it more specifically refers to “writing paper, especially with matching envelopes.”
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An easy way to remember the difference between these two terms is to remember their single letter difference. If you mean something that would stay and not move, then you should use the adjective stationary. Meanwhile, you should use the noun stationery if you are referring to a kind of paper or office material.