Meaning : A distinct part that can be specified separately in a group of things that could be enumerated on a list.
Example :
He noticed an item in the New York Times.
She had several items on her shopping list.
The main point on the agenda was taken up first.
Synonyms : point
Meaning : A small part that can be considered separately from the whole.
Example :
It was perfect in all details.
Synonyms : detail, particular
Meaning : A whole individual unit. Especially when included in a list or collection.
Example :
They reduced the price on many items.
Meaning : An individual instance of a type of symbol.
Example :
The word `error' contains three tokens of `r'.
Synonyms : token
Meaning : (used when listing or enumerating items) also.
Example :
A length of chain, item a hook.