1. marking or signing with one’s initials
Usage: present participle of ‘initial’

1. the act of marking or signing with initials
Usage: gerund form

Examples

• She was initialling each page of the contract.
• The manager spent the morning initialling expense reports.
• After initialling the document, he passed it to his colleague.
• The initialling of official papers requires careful attention.
• He finished initialling the last memo before lunch.
• The secretary was responsible for initialling all correspondence.