Rectilinearly is an adverb that describes movements or shapes that are straight or consisting of straight lines. Some synonyms for rectilinearly include: linearly, directly, straightly, in a straight line, as the crow flies, in a beeline, in a direct line, lineally, rigidly, squarely, and righteously. These words can be used interchangeably with rectilinearly when discussing motions or geometric figures with straight sides such as squares, rectangles, and triangles. Additionally, they can be used to talk about someone's movements if they are moving steadily and without deviation. Learning synonyms for words like rectilinearly can help writers add variety and precision to their language conveying meaning more effectively.