Words similar to optional

Example sentences for: optional

How can you use “optional” in a sentence? Here are some example sentences to help you improve your vocabulary:

Each StandardQuantitationType has an optional association to Channel and a designator indicating whether the value refers to the background or foreground.
Under current rules, the date of manufacture is optional.
The bra is a keener pleasure for being optional.
Finally, an optional 'user-defined sequence filter' simply eliminates the 70 mer candidates containing the defined sequences.
The actual file format consists of six columns: sequence number, residue number, three columns for the primary color space (red green blue, RGB) designation of the color, and an optional comment/property column (Figure 1c).