sabbatical

Concise Oxford English Dictionary © 2008 Oxford University Press:
sabbatical /səˈbatɪk(ə)l/

▶noun a period of paid leave granted to a university teacher for study or travel (traditionally one year for every seven years worked). ▶adjective

• 1 relating to a sabbatical.

• 2 archaic of or appropriate to the sabbath.

– origin C16: via late L. from Gk sabbatikos ‘of the sabbath’ + -al.