adverb
on the one hand
B1
Means 'on the one hand' used to present one side of a contrast (often paired with andererseits 'on the other hand'). It's a conjunctive adverb; often stands at sentence start or before the verb and is followed by a comma. Not reflexive, no preposition required.
Examples
Einerseits möchte ich mehr reisen, andererseits fehlen mir Zeit und Geld.
On the one hand I want to travel more; on the other hand I lack the time and money.
Einerseits wollte die Verwaltung das Projekt stoppen, obwohl die Experten vor den Folgen gewarnt hatten.
On the one hand the administration wanted to stop the project, although the experts had warned about the consequences.
Details
Mnemonics
Picture a balance scale: label the left pan 'einerseits' (on the one hand).
Sounds like 'one-are-ice' — think 'one side'.
Notes
'einerseits ... andererseits' is a common pairing (on the one hand ... on the other hand). It's a discourse marker used to show contrasting points.