Englishfor English speakers
certificate
Noun
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A certificate is a paper that acknowledges something like an award.
I finally got my certificate of honor from school.
chain
Noun
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A chain is a series of round pieces of material joined together to make a line.
He got her a gold chain necklace for her birthday.
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A series of interconnected things.
This led to an unfortunate chain of events.
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A chain of stores is a group of stores that all have the same name, such as McDonald's restaurants or GAP clothing stores.
chain
Verb
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If you chain things together, you connect them in a line.
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If you chain A to B, you connect A to B with a chain.
The dog was chained to the tree.