jam
n. C / U A2 Elementary Oxford US //ˈdʒæm// UK //dʒˈæm// jam
n. a sweet food made by cooking fruit with sugar until it is thick. You usually spread it on bread or toast for breakfast.
n. a preserve made from whole fruit boiled with sugar until it reaches a gel-like consistency.
I like to put strawberry jam on my toast.
She bought a jar of homemade raspberry jam from the local farmers' market to serve with scones.
The high sugar content in traditional jam acts as a natural preservative, inhibiting the growth of bacteria and extending the shelf life of the fruit.
Usage
Uncountable when referring to the substance in general; countable when referring to a specific variety or a jar of the product.