sight·ing 
(sītĭng)
(sītĭng)n.
The act of catching sight of something, especially something unusual or searched for: a sighting of a whale in the harbor; a reported sighting of a UFO.
- circulating library
- circulation
- circulative
- circulator
- circulatory
- circulatory system
- circum-
- circumambience
- circumambiency
- circumambient
- circumambiently
- circumambulate
- circumambulation
- circumboreal
- circumcise
- circumciser
- circumcision
- circumduction
- circumference
- circumferential
- circumfix
- circumflex
- circumfluent
- circumfluous
- circumfuse