The activity of keeping a diary, also known as journal.(noun)
Present participle of journal.(verb)
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Use "journaling" in a sentence
"I think that journaling is the one thing that kept me sane and helped me keep control of my mind/thoughts."
"A better alternative to MS Word that simplifies and organizes much better for journaling is Yeah Write: [www. yeahwrite.com] It's shareware with paid and free versions, but I've only done free."
"Patti – character journaling is something I may have to try."