Etymology
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acting (adj.)

1590s, "putting forth activity, active," present-participle adjective from act (v.). Meaning "performing temporary duties" is from 1797.

acting (n.)

c. 1600, "performance of deeds;" 1660s, "performance of plays;" verbal noun from present participle of act (v.). Acting out "abnormal behavior caused by unconscious influences" is from 1945 in psychiatry.

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Definitions of acting
1
acting (n.)
the performance of a part or role in a drama;
Synonyms: playing / playacting / performing
2
acting (adj.)
serving temporarily especially as a substitute;
the acting president
From wordnet.princeton.edu