The word "hadst coition" is an archaic form of "had intercourse." It is spelled with a combination of Middle English and Old English letters, which can make it confusing for modern readers. The "d" and "s" in "hadst" are pronounced separately as /hædst/, while "coition" is pronounced as /kɔɪʃən/. The unusual spelling of the word is a reminder of how spellings have evolved over time and how language has changed to meet the needs of its users.
The phrase "hadst coition" is not a word with a specific etymology, as it is the combination of two different words: "hadst" and "coition".
1. "Hadst" is the past tense second person singular form of the verb "have" in Early Modern English. This form specifically refers to the verb "to have" in the past tense when addressing the second person singular, such as "you had" or "thou hadst". It is derived from the Old English word "hæfdes" or "hæfdest" meaning "had" or "held".
2. "Coition" comes from the Latin word "coitus", which means "a coming together" or "a uniting". In English, "coition" refers to sexual intercourse or the act of coming together sexually.