adverb
besides
A2
Außerdem is an adverb meaning besides, furthermore, or in addition. It links clauses or adds extra information: Außerdem habe ich keine Zeit (besides, I have no time). It’s a conjunctive adverb, not reflexive, and doesn’t govern a specific preposition or case.
Examples
Der Plan wurde geändert, außerdem entschieden die Organisatoren, dass die Veranstaltung kleiner stattfinden sollte.
The plan was changed; furthermore the organizers decided that the event should take place on a smaller scale.
Ich habe keine Zeit. Außerdem bin ich müde.
I don't have time. Besides, I'm tired.
Details
Mnemonics
picture a list of reasons and one more item popping up with a label 'außerdem'
sounds like 'out-say-dem' -> 'besides/moreover'
Notes
A discourse adverb meaning 'besides' or 'moreover'. Used to add information or reasons.