What is Subitem?

Subitem definition and meaning on Dictionary terms:
a separate article or particular: 50 items on the list.
a separate piece of information or news, as a short piece in a newspaper or broadcast.
Slang. something suitable for a news paragraph or as a topic of gossip, especially something that is sensational or scandalous: The bandleader and the new female singer are an item.

a word formerly used in communications to represent the letter I.
an admonition or warning.
Older Use. an intimation or hint.

also; likewise (used especially to introduce each article or statement in a list or series).

verb (used with object) Archaic.
to set down or enter as an item, or by or in items.
to make a note of.