noun
binder
BYN-duh
noun
1
A cover or folder used to hold loose sheets of paper together.
"He kept all his lecture notes in a ring binder."
2
A person or machine that binds things, such as someone who binds books, or a farm machine that ties harvested crops into bundles.
"The old binder machine cut the wheat and tied it into sheaves."
3
A substance that causes other materials to stick together.
"Egg is often used as a binder in meatloaf recipes."
4
A garment worn to flatten the chest, especially by trans men.
"He wore a binder every day before starting hormone therapy."
How to Use Binder
Learner’s notesIn plain EnglishAnything — a person, tool, machine, or substance — whose job is to hold things together.
Common pairings
ring binder
three-ring binder
chest binder
Word Forms
binders plural
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He kept all his lecture notes in a ring _____.
Etymology
From Middle English byndere, simply "bind" plus the agent suffix "-er" — someone or something that binds.