English
irretention
From ir- + retention.
Proto-Indo-European *ten- ‘to stretch, draw’
…
Latin retineō ‘retain’
Latin retentus ‘restrained, delayed’
Latin retentiō
Middle English retencioun
English retention
Today it means
noun Absence of retention; the state or quality of being irretentive; lack of power to retain information
Language periods are conventional ranges, not dates for this word.
Etymograph / irretention