noun
idea, inkling, notion
A2
A noun meaning 'idea', 'inkling' or 'notion'. Feminine (die Ahnung), plural 'Ahnungen'. Common collocations: 'Ahnung haben' uses the verb haben, and you say 'Ahnung von + Dative' for knowledge about something. Frequent fixed phrase: 'keine Ahnung' (no idea). No irregular plural.
Examples
Ich habe keine Ahnung, wo mein Schlüssel ist.
I have no idea where my key is.
Hast du eine Ahnung, ob das Treffen stattfindet?
Do you have an inkling whether the meeting will take place?
Die Expertin erklärte den Plan ausführlich, weil die Kollegen keine Ahnung von dem neuen Projekt hatten.
The expert explained the plan in detail because the colleagues had no idea about the new project.
Details
Mnemonics
Sounds like 'a hunch' — 'Ahnung' = a hunch/idea.
die Ahnung — imagine a female detective (die) having an idea.
Notes
Common collocation: 'keine Ahnung' = 'no idea'. Often used in everyday speech.