Renewal vs Retention - What's the difference?

As nouns the difference between renewal and retention

is that renewal is the act of renewing while retention is retention.

(en noun)

The act of renewing.

(fencing) An offensive action made immediately after a parried one

* urban renewal

(wikipedia retention)

(en noun)

The act of retaining or something retained

* 1599 , , II. iv. 95:

No woman's heart / So big, to hold so much; they lack retention .

The act or power of remembering things

A memory; what is retained in the mind

(medicine) The involuntary withholding of urine and faeces

(obsolete) That which contains something, as a tablet; a means of preserving impressions.

(Shakespeare)

(obsolete) The act of withholding; restraint; reserve.

* 1599 , , V. i. 79:

His life I gave him, and did thereto add / My love without retention or restraint,

(obsolete) A place of custody or confinement.

(legal) The right to withhold a debt, or of retaining property until a debt due to the person claiming the right is duly paid; a lien.

(Erskine)

(Craig)