Stationery is pens, paper and other office supplies. Order stationery, a stationery cupboard, headed stationery.
The trick for the spelling is the e in paper and the a in stand still: stationery with an e is the goods and stationary with an a means not moving. It comes from stationer, a seller with a fixed stall rather than a travelling one.
1nounstationeryPens, paper and other office supplies.
“I bought some nice stationery for writing thank-you letters.”
stationery is supplies.
From stationer, a trader with a fixed station or stall, as against a pedlar. Stationers were originally booksellers near universities.
From stationer + y.
Etymology from Wiktionary, CC BY-SA