Origin: Latin suffix -ary
Precautionary has 3 different meanings across 1 category:
A precaution.
"The manager implemented a precautionary lockdown after spotting suspicious activity at the back entrance."
taken in advance to protect against possible danger or failure
"gave precautionary advice"
"I would take precautionary steps to keep him away"
Of, pertaining to, or serving as a precaution
"The company took several precautionary measures before launching the new software update to ensure no data was lost."