a small part that can be considered separately from the whole
"it was perfect in all details"
a whole individual unit; especially when included in a list or collection
"they reduced the price on many items"
A distinct physical object.
"The lost item was found tucked inside her jacket pocket."
In plain English: An item is just a single thing or object that you can see or hold.
"She checked every item on her shopping list before leaving the store."
Usage: Use "item" to refer to any single, distinct physical object or entry within a list, such as an item on a shopping receipt or a specific piece of furniture. It works well when you need to emphasize that something is one separate unit among many others.
To make a note of.
"Please item every expense on your report so we can track our budget accurately."
In plain English: To item means to list things separately on a bill or document.
"He itemized all the expenses on the receipt."
Usage: Use the verb itemize (or list items) to mean making a note of things on a list or receipt, rather than using "item" alone as an action word. You would say "please itemize your expenses" to indicate that someone should write down each specific cost clearly.
likewise
"The item likewise appeared on everyone's shopping list, proving it was a universally desired product."
In plain English: There is no such thing as an adverb called "item," so you cannot define it because that word only means a single object or point on a list when used as a noun.
"Please do not put any item in your luggage without declaring it first."
Usage: The word "item" functions only as a noun or interjection in standard English and does not have an adverbial form meaning "likewise." To express that something is also true or applicable, use the adverb "also," "too," or "likewise" instead.
The word comes from Middle English item, which was borrowed from Latin for the meaning "also" or "in the same manner." Its modern sense developed when people began referring to individual entries in a list by this term, following an opening phrase like "firstly."