1. In a sporadic manner
   - sporadically 
2. At regular time intervals

See also: periodical

• septenary
• septennial
• septentrional
• septet
• septette
• septic
• septic sore throat
• septic tank
• septicaemia
• septicemia
• septicemic
• septicemic plague
• septicidal
• septillion
• Septobasidiaceae
• Septobasidium
• Septobasidium pseudopedicellatum
• septrional
• septua-
• septuagenarian
• Septuagesima
• Septuagesima Sunday
• Septuagint
• septum
• septuple