Gerund functioning as an uncountable noun meaning the act or process of magnifying
Precise magnifying of the text revealed previously hidden annotations.
Le grossissement précis du texte a révélé des annotations auparavant cachées.
magnifygerund / present participle Used attributively (e.g., "magnifying glass") to describe something that enlarges.
She inspected the gem under a magnifying lamp.
Elle a examiné la pierre précieuse sous une lampe grossissante.