1. Further or added
   "called for additional troops"
   - extra

See also: additive

• SSS
• SSSI
• SSW
• St Andrews's cross
• St Bernard
• St John's Day
• St John's Eve
• St John's Night
• St John's wort
• St John's wort family
• St Martin's Day
• St Mihiel
• St Patrick's Day
• St Peter's wort
• St Valentine's Day
• st.
• St. Ambrose
• St. Andrew
• St. Andrew's cross
• St. Anselm
• St. Anthony's cross
• St. Athanasius
• St. Augustine
• St. Augustine grass
• St. Baeda