A set or group with ten elements.
We divided the chocolates into tens to hand out to Hallowe'en visitors.
A card in a given suit with a value of ten.
A denomination of currency, such as a banknote, with a value of ten units. See also tenner.
Can you give me two tens for this twenty?
A perfect specimen, a physically attractive person.
A high level of intensity.
The act of rowing ten strokes flat out.
A pair of tens.
The second decade of a century: the 1910s, 2010s, etc. The teens, the oneties.