Recti-linear refers to a characteristic of having straight lines or consisting of straight lines. There are several synonyms for recti-linear, including linear, straight, even, parallel, and symmetric. These synonyms can be used interchangeably with the term recti-linear in different contexts. For instance, a recti-linear building can also be referred to as a linear or straight building, while a recti-linear pattern can be called an even or symmetric pattern. The appropriate synonym to use will depend on the context in which it is being used. Therefore, it is essential to understand the nuances of each term to ensure clear communication.