1. As a favour; not compelled by legal right
   "ex gratia payments made to nonstriking workers"

See also: optional

Encyclopedia: Ex gratia

• silky tamarin
• silky terrier
• silky willow
• silky wisteria
• silky-haired
• silky-leafed
• silky-leaved
• sill
• sillabub
• Sillaginidae
• Sillago
• sillcock
• sillily
• silliness
• sillock
• Sills
• silly
• silly billy
• silly season
• silo
• siloxane
• Silphium
• Silphium laciniatum
• silt
• silt up