
die Einnahme
intake
The act of swallowing medication, food, or liquids. Often used in a medical context.
Der Arzt empfahl die Einnahme der Tablette mit reichlich Wasser.
The doctor recommended taking the tablet with plenty of water.
intake / revenue / capture
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intake
The act of swallowing medication, food, or liquids. Often used in a medical context.
Der Arzt empfahl die Einnahme der Tablette mit reichlich Wasser.
The doctor recommended taking the tablet with plenty of water.

revenue
Money that a person, company, or organization receives during a specific period. Usually used in the plural (die Einnahmen).
Die Einnahmen aus dem Ticketverkauf übertrafen alle Erwartungen.
The revenue from ticket sales exceeded all expectations.

capture
The military conquest and occupation of a city, fortress, or territory.
Die Einnahme der strategisch wichtigen Brücke war entscheidend für den weiteren Verlauf der Schlacht.
The capture of the strategically important bridge was decisive for the further course of the battle.
'Die Einnahme' is the nominalization of the separable verb 'einnehmen' (to take in). This origin connects all meanings: taking medicine, taking in money, and taking a city.
Das Unternehmen konnte hohe Gewinne einnehmen.
The company was able to take in high profits.
The three main meanings are clearly separated by context. Medical context ('Tabletten' (tablets), 'Arzt' (doctor)), financial context ('Geld' (money), 'Kasse' (cash register), 'Gewinn' (profit)), or military context ('Stadt' (city), 'Festung' (fortress), 'Truppen' (troops)).
Die Einnahme des Medikaments sollte nach dem Essen erfolgen.
The medication should be taken after eating.
When it is about money, the plural 'die Einnahmen' is almost always used. The counterpart to this is 'die Ausgaben' (expenses).
Wir müssen unsere Einnahmen und Ausgaben genau kontrollieren.
We have to monitor our revenue and expenses carefully.
In a medical context, 'Einnahme' is often combined with temporal prepositions to indicate the right time, e.g., 'vor der Einnahme' (before taking it), 'nach der Einnahme' (after taking it), or 'während der Einnahme' (while taking it).
Lesen Sie die Packungsbeilage vor der ersten Einnahme sorgfältig durch.
Read the package leaflet carefully before taking it for the first time.
application / use
When referring to medication, Anwendung can describe the way it is used, even when it is applied externally. Einnahme, by contrast, means swallowing medication and is therefore a more specific form of Anwendung. Use Einnahme for tablets or liquids, and Anwendung also for ointments or bandages.

Die Einnahme der Tabletten soll zweimal täglich nach dem Essen erfolgen.
The tablets should be taken twice a day after meals.
Die Anwendung der Salbe auf der betroffenen Stelle soll zweimal täglich erfolgen.
The ointment should be applied to the affected area twice a day.