English
intentiveness
From intentive + -ness.
Formed from intentive + -ness
Proto-Indo-European *téndeti
…
Latin intendō ‘to intend, to attend’
Late Latin intentīvus ‘intensive’
Old French ententif
Middle English ententif
English intentive
Today it means
noun Closeness of attention; attentiveness; concentration.
Language periods are conventional ranges, not dates for this word.
Etymograph / intentiveness