different between retaining vs retentional

English

retaining (not comparable)

Of or pertaining to something that retains something else, as with a retaining wall.

retaining

retaining (plural retainings)

The act by which something or someone is retained; a retention.
- 1989, John Malcolm William Bean, From Lord to Patron: Lordship in Late Medieval England (page 212)
  All retainings by indenture before that date were declared null and void 'other than to be the household servant or officer or of his [the lord's] council for lawful service done or to be done'.

retention +? -al

retentional (comparative more retentional, superlative most retentional)

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