1
always used before a noun
: having a value that is above zero : positive
The temperature was plus 10 degrees. [=10 degrees above zero]
2
—used after a letter grade (such as A, B, or C) to show that the work is slightly better than the letter by itself would indicate
He got a C plus in history.
3
—used after a number to indicate a range greater than that number
The concert is an 18-plus show. [=a show for people who are 18 years old or older]
This stadium seats 20,000-plus people. [=more than 20,000 people]
plural pluses
1
informal
: something that is useful or helpful
The apartment isn't perfect, but the fact that it has new appliances is a plus.
The state college's low tuition is only one of its pluses. [=advantages, benefits]
The job doesn't pay well, but the convenient hours are a definite plus.
2
mathematics
: plus sign
1
—used to indicate that one number or amount is being added to another
4 plus 5 equals/is 9
The cost is $10 plus $2 for shipping.
2
: and also : as well as
The hotel has two restaurants, plus a bar and a swimming pool.
informal
: in addition : and
He works a full-time job during the day, plus he goes to school at night.
I enjoy gardening, plus it's good exercise.
Cite this Entry
“Plus.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/plus. Accessed 23 Jun. 2026.
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