[f. ACT v. + -ING2.]
1. Performing (dramatically).
2. Performing functions, putting forth activity.
1597. Daniel, Civile Wares, VII. xxxiv. The acting spirits up and awake doe keepe.
3. Performing temporary or special duties; on temporary service.
1797. Nelson, in Nicolass Despatches, VII. 133. The Gunner of the Peterell not having joined, I shall put John Brady acting into the Peterell.
¶ In senses 2 and 3 it is used esp. as a qualifying adj. to official titles, meaning either doing duty temporarily, as Acting-Captain; or doing duty solely, though nominally associated with another or others who take no practical share in the work, as Acting-Manager, -Secretary, -Trustees, -Executors, etc.
1801. Nelson, in Nicolass Despatches, IV. 287. Our friend Troubridge will tell you his opinion of the present Acting-Captain of the San Josef.
1832. Ht. Martineau, Hill & Valley, ii. 19. He resolved to be an acting partner.