Recently I answered like this.
What came to my mind first when reading the OP's question was, that the meaning of the word "affection" should be Merriam's
1 : any moderate feeling or emotion
But second thought came to my mind, "wait!,there is a different meaning for affection", which is according to Merriam,
3 a (1) : a bodily condition (2) : disease, malady
But unlike other users' answer, the Merriam doesn't label that meaning as archaic.
In such case, what do you think is the best strategy not to make a mistake?
Thank you for any support.