best mode
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
The requirement that an inventor disclose the preferred way of working the invention known to them at filing.
They kept the optimal catalyst back, which used to be a fatal best mode violation.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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