When searching for a unit, there is no need to specify the definition of it.

For example:
There is no need to write "US fluid ounce" but instead you only need to enter "ounce". All available definitions of the unit will be shown after the search is complete.

A list of suggestions is shown while you are typing and is constantly being updated for each letter you enter in the text field. However you must enter at least 2 letters in order to start the suggestion function.