locum tenens Meaning, Definition & Usage

  1. noun someone (physician or clergyman) who substitutes temporarily for another member of the same profession
    locum.

WordNet

Lo"cum te"nens
Etymology
L., holding the place; locus place + tenens, p. pr. of tenere to hold. Cf. Lieutenant.
Definitions
  1. A substitute or deputy; one filling an office for a time.

Webster 1913