Common words:
* Circumference: The distance around a circle or other closed curve.
* Circumnavigate: To sail or travel completely around something, especially the earth.
* Circumspect: Careful to consider all circumstances and possible consequences.
* Circumstance: A fact or condition connected with or relevant to an event or action.
* Circumvent: To avoid something, especially cleverly or illegally.
Less common words:
* Circumjacent: Surrounding; adjacent.
* Circumlocution: The use of more words than necessary to express something, especially to avoid saying something directly.
* Circumnavigate: To sail or travel completely around something, especially the earth.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumscribe: To restrict or limit something.
* Circumstance: A fact or condition connected with or relevant to an event or action.
* Circumspect: Careful to consider all circumstances and possible consequences.
* Circumstantial: Relating to or depending on circumstances.
* Circumstantial evidence: Indirect evidence that suggests a fact but does not prove it directly.
* Circumstantial: Relating to or depending on circumstances.
Technical/Specialized:
* Circumcision: The surgical removal of the foreskin of the penis.
* Circumstellar: Relating to or occurring around a star.
* Circumferential: Relating to or affecting the circumference of something.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
* Circumvent: To avoid something, especially cleverly or illegally.
This list is not exhaustive but gives you a good starting point for understanding the different uses of the prefix "circum-."