noun
partner (female), female partner
A1
Partnerin: feminine noun meaning 'partner (female)' or 'female companion', used for business or personal relationships. Gender: die. Plural: die Partnerinnen (regular -innen plural). Declines: der Partnerin, der Partnerinnen. It’s the feminine form of Partner; no special prepositions or irregularities. Common in formal and everyday German.
Examples
Die Firma nahm eine Partnerin auf, die sich schnell einfügte, obwohl sie wenig Erfahrung mitbrachte.
The company took on a (female) partner who integrated quickly, although she brought little experience.
Meine Partnerin ist sehr freundlich.
My partner is very friendly.
Meine Partnerin ist eine sehr erfolgreiche Geschäftsfrau.
My partner is a very successful businesswoman.
Details
Mnemonics
visualize a woman labelled 'Partnerin' standing beside someone
partner + -in (female ending)
die -> imagine a woman icon to remember feminine gender
Notes
Partnerin is the feminine form of Partner. Use -in to form many feminine agent nouns in German.