In a paired or two-part manner; in a way that exhibits binate characteristics.
From 'binate' + '-ly' (the adverbial suffix). Formed by adding the standard English adverb-forming suffix to the adjective 'binate,' following normal English word formation patterns.
Adverbs ending in '-ly' are one of English's great productivity features—you can take almost any adjective and instantly make a way to describe doing something. 'Binately' is rare enough that most people haven't heard it, but a botanist would immediately understand: things arranged in twos, across the board.
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