TINY QUANTITY is a term used to describe a very small amount of something. The crossword solutions for this term are ATOM (4 letters), MITE (4 letters), and IOTA (4 letters). ATOM refers to the smallest particle of an element that still retains its chemical properties. MITE is a term used to describe a very small creature or object. Lastly, IOTA is a Greek letter that is also used to refer to a very small amount of something.