The word "normal" can be used to describe something that is common or expected. However, when used in conjunction with "elongation" - the act of lengthening or stretching - its meaning can become more specific. In this context, "normal to elongation" means perpendicular or orthogonal to the stretching direction. Synonyms for this phrase might include "perpendicular to lengthening," "at a right angle to elongation," or "transverse to stretching." It is important to note that these synonyms are more commonly used in technical or scientific contexts, particularly in fields such as engineering or materials science where elongation is often a key factor in understanding the properties and behavior of materials under stress.