Definition of crackajack in English:

crackajack

Syllabification: crack·a·jack
Pronunciation: /ˈkrakəˌjak
 
/

adjective

Variant spelling of crackerjack.

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected