immutable
adj 2noun 1
Definitions
adj
1
Unable to be changed without exception.
The government has enacted an immutable law.
Mutable as is our nature, it delights in the immutable: and we expect as much constancy as if all time, to say nothing of our own changeableness, had not shewn that ever "the fashion of this world passeth away."
2
Not able to be altered in the memory after its value is set initially.
Constants are immutable.
noun
1
Something that cannot be changed.
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