1. In an optional manner
   "this rule is applied optionally"

See also: optional

Antonym: obligatorily

• semolina
• Sempatch
• sempervivum
• sempiternal
• sempiternity
• sempre
• sempstress
• Semtex
• sen
• senary
• senate
• senate campaign
• senate race
• senator
• senatorial
• senatorship
• send
• send a message
• send around
• send away
• send back
• send down
• send for
• send in
• send on