1902 Jrnl. Soc. Chem. Industry 21 1102/2 Schönbein..found that sulphurous acid had a remarkable ‘activating’ (activirende) effect on various oxidising substances.

1908 Jrnl. Philos., Psychol. & Sci. Methods 5 163 When we are awake the nervous system is used for the regulation and the activating of all the bodily mechanisms.

1960 B. S. Childs Myth & Reality in Old Test. iv. 77 The cult was not a re-enactment of the primeval acts, but an activating of the redemptive acts occurring in chronological time.

1993 E. Suss When Hearing gets Hard ii. 21 With the VC Handset, only the simple activating of a T switch on the hearing aid is required.

2000 C. Hoskyns in M. Rossilli Gender Policies in European Union iii. 46 The first achievement during that period was the activating of Article 119 of the Treaty of Rome.

1926 Public Opinion 22 Oct. 408/3 The planet and its activating sun.

1939 Trans. Faraday Soc. 35 126 It may be imagined that the function of the activating impurity is to enter the host lattice and produce therein centres of distortion.

1949 H. W. C. Vines Green's Man. Pathol. (ed. 17) xxxvii. 1040 Proliferation of these tissues depends upon œstrogenic activity, and probably dihydro-œstrone is the activating hormone.

1977 J. March Adv. Org. Chem. (ed. 2) xi. 463 The cyclopropyl group is highly activating.

2004 Science 8 Oct. 195 About 50% of all T-ALLs have activating mutations in the gene encoding NOTCH1.