* Old English: The word "cnyttan" meaning "to knot, tie" existed in Old English, which suggests "knit" has been around for a very long time.
* 14th Century: The word "knitten" starts appearing in Middle English texts, indicating it was becoming more commonly used.
* 16th Century: The first dictionaries were being compiled. While the exact date of "knit" being added is unknown, it likely was included in the early dictionaries during this period.
Therefore, the word "knit" was likely added to a dictionary sometime in the 16th century, but its exact date is unclear.