Definition
The legal and mental ability to make a valid will, requiring sufficient understanding of your property and the natural objects of your affection (even if you hate them).
Example Usage
The will was challenged on grounds that the testator lacked testamentary capacity due to advanced dementia.
Origin
From Latin 'testamentum' meaning will or testament
Fun Fact
The standard for testamentary capacity is lower than the standard for general legal capacity; courts presume capacity unless proven otherwise.
Source: Probate and estate law terminology
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