
einleiten
to initiate
To begin something or make the start of something, often a process, event, or action.
Der Vorsitzende leitete die Sitzung mit einer kurzen Begrüßung ein.
The chairperson initiated the meeting with a brief greeting.
to initiate / introduce
Loading your saved state.

to initiate
To begin something or make the start of something, often a process, event, or action.
Der Vorsitzende leitete die Sitzung mit einer kurzen Begrüßung ein.
The chairperson initiated the meeting with a brief greeting.

to discharge / introduce
To deliberately guide or bring something into a system, cycle, or body.
Die Fabrik darf keine ungeklärten Abwässer mehr in den Fluss einleiten.
The factory is no longer allowed to discharge untreated wastewater into the river.

to induce
In medicine, to artificially bring about or start labor in a pregnant woman.
Da das Baby überfällig war, mussten die Ärzte die Geburt einleiten.
Because the baby was overdue, the doctors had to induce labor.

to introduce
To begin a text, sentence, or speech with particular words or a particular phrase.
Er leitete seinen Vortrag mit einem überraschenden Zitat ein.
He introduced his presentation with a surprising quote.
'Einleiten' is a separable verb. The prefix 'ein-' goes to the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Die Polizei leitet sofort eine Untersuchung ein.
The police immediately initiate an investigation.
The verb consists of the prefix 'ein-' (in/into) and the verb 'leiten' (to guide/lead). The literal meaning is therefore 'to guide into', which describes the start of a process or the bringing of something into something.
Mit diesem Satz leiten Sie den Hauptteil Ihres Aufsatzes ein.
With this sentence, you introduce the main part of your essay.
In formal contexts, 'einleiten' is often used for the beginning of official processes: 'ein Verfahren einleiten' (to initiate proceedings), 'Ermittlungen einleiten' (to initiate investigations), or 'rechtliche Schritte einleiten' (to initiate legal steps).
Die Staatsanwaltschaft hat ein Ermittlungsverfahren eingeleitet.
The public prosecutor's office has initiated an investigation.
In connection with words like 'Fluss' (river), 'Meer' (sea), 'Abwasser' (wastewater), or 'Chemikalien' (chemicals), 'einleiten' means that a substance is brought into a system. This use often has a negative connotation.
Es ist streng verboten, Giftstoffe in das Grundwasser einzuleiten.
It is strictly forbidden to discharge toxic substances into the groundwater.
When beginning a text or speech, the preposition 'mit' (with) is often used to name the means or the first words: 'etwas mit etwas einleiten' (to introduce something with something).
Die Kanzlerin leitete ihre Rede mit einem Dank an die Helfer ein.
The chancellor introduced her speech with thanks to the helpers.
to begin
In the context of a procedure, beginnen neutrally refers to its point of beginning in time. einleiten emphasizes more strongly that someone sets the process in motion through deliberate initial measures. If the focus is only on when the procedure starts, beginnen is appropriate; if the initiating steps are central, einleiten is appropriate.

Die Behörde leitet das Verfahren mit einer schriftlichen Prüfung ein.
The authorities initiate the procedure with a written review.
Das Verfahren beginnt am kommenden Montag.
The procedure begins next Monday.