Learner's definition of VARIETY
1 [singular] : a number or collection of different things or people — usually + of
The talks covered a wide/great variety of topics. [=the talks covered many different topics]
The company sells a variety of gardening products.
They broke up for a variety of reasons.
The conference attracts a wide variety of people.
He has a variety of health problems.
2 [noncount] : the quality or state of having or including many different things
I was surprised by the variety of the choices that were available.
Our diet lacks variety.
My life needs more variety.
You know what they say: variety is the spice of life. [=life is more interesting and enjoyable when you do different things]
3 [count] : a particular kind of person or thing
The museum has aircraft of every variety. [=kind, sort]
people of all varieties
different varieties of oranges
exotic varieties of snakes
4 [noncount] : a type of entertainment that has many short performances (such as dances, skits, and songs) which follow one another and that are not related — usually used before another noun