Valid
Valid adjective - According to the rules of logic.
Working and valid are semantically related. In some cases you can use "Working" instead an adjective "Valid".
Nearby Words: validity, validation
Both words in one sentence
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Mack's arguments against the Mechans, especially, are 100% valid in terms of what science actually is (in terms of being a method of working out how the world works, not just the set of laws that the system uncovers in ours).
Source: Literature / Tales of MU -
It can also occur where there is a sense of order, just not one that the character recognises as valid, such as a Wretched Hive where the "order" comes from corruption and Might Makes Right, or more dubiously, a working society they deem to be chaotic or inferior.
Source: Lawful Neutral - However, there actually is a valid reason for putting an atmosphere around it: exposure to hard vacuum can cause many types of non-specialized lubrication to flash-evaporate, causing the working parts to quickly wear out to inoperable.
Source: Accidentally Accurate
Cite this Source
Working and Valid. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/valid/working
Valid & Working. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/valid/working>.
Working or Valid. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/valid/working.
Google Ngram Viewer shows how "valid" and "working" have occurred on timeline