Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
Source: wiktionary
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Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
Source: wiktionary
They took figures for the abundance of invasive weeds mapped according to the normal grid unit of the 'hectad', or 10 × 10 km square, and then looked at how abundant these species were mapped at a much finer scale – in 'tetrads', or 2 × 2 km squares, inside these hectads.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.