What is the difference between: a) segmented and segmental; b) post-tensioned and post-tensioning?
a) I think segmented is used when there are physically separate segments eg an earthworm is a segmented animal, and segmental when the concept is indicated and is more about partial segmentation - right now I can't actually think of an example.
b) sometimes the context in which you read the words tell you how to use them, but I will add that post-tensioning could also be the noun, while post-tensioned is the adjective: post-tensioned cables ??
Hopefully someone who is more familiar with the words can help out.