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We found 29 dictionaries with English definitions that include the word activation:
Click on the first link on a line below to go directly to a page where "activation" is defined.

General (19 matching dictionaries)

1. activation: Merriam-Webster.com [home, info]
2. activation: Oxford Dictionaries [home, info]
3. activation: Collins English Dictionary [home, info]
4. activation: Vocabulary.com [home, info]
5. Activation, activation: Wordnik [home, info]
6. activation: Cambridge Advanced Learner's Dictionary [home, info]
7. activation: Wiktionary [home, info]
8. activation: Dictionary.com [home, info]
9. activation: UltraLingua English Dictionary [home, info]
10. activation: Cambridge Dictionary of American English [home, info]
11. Activation: Wikipedia, the Free Encyclopedia [home, info]
12. activation: Rhymezone [home, info]
13. activation: Free Dictionary [home, info]
14. activation: Mnemonic Dictionary [home, info]
15. activation: WordNet 1.7 Vocabulary Helper [home, info]
16. activation: LookWAYup Translating Dictionary/Thesaurus [home, info]
17. activation: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

18. activation: Legal dictionary [home, info]

Computing (1 matching dictionary)

19. activation: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

20. activation: online medical dictionary [home, info]
21. activation: Medical dictionary [home, info]

Religion (1 matching dictionary)

22. activation: Father Jeromes DICTIONARY of Words/Phrases Used in the QUFD Website [home, info]

Science (2 matching dictionaries)

23. Activation: The Computational Beauty of Nature [home, info]
24. Activation: NRC Glossary of Nuclear Terms -- [home, info]

Tech (3 matching dictionaries)

25. Activation: AUTOMOTIVE TERMS [home, info]
26. activation: DOD Dictionary of Military Terms [home, info]
27. activation: Construction deterioration & building durability glossary [home, info]

(Note: See activator for more definitions.)

Quick definitions from WordNet (activation) ▸ noun:  making active and effective (as a bomb) ▸ noun:  stimulation of activity in an organism or chemical ▸ noun:  the activity of causing to have energy and be active ▸ Also see activator ▸ Words similar to activation ▸ Usage examples for activation ▸ Popular adjectives describing activation ▸ Words that often appear near activation ▸ Rhymes of activation ▸ Invented words related to activation