English
infinitively
From infinitive + -ly.
Formed from infinitive + -ly
Latin fīnis ‘boundary, limit’
…
Latin fīnītus ‘finished, terminated, having been finished or…’
Latin īnfīnītus ‘unlimited, infinite’
Late Latin īnfīnītīvus ‘unlimited, indefinite’
Middle English infenitife ‘without end, in perpetuity’
English infinitive
Today it means
adv In the infinitive form.
Language periods are conventional ranges, not dates for this word.
Etymograph / infinitively