First off
Definition 1 of 1
Pro Tip 1/3Conversational Tone
Used in a relaxed or friendly context, not for formal occasions. 
First off, let's all introduce ourselves.
Pro Tip 2/3Sequence Cue
Signals the beginning of a list or series of points. 
First off, budgeting; secondly, scheduling; and finally, execution.
Pro Tip 3/3Informal Priority
Indicates that something is a priority, in an informal or casual manner. 
First off, we need to make sure everyone's comfortable.
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