Part of speech: verb

Definition: to move with or as if with long steps

Source: http://www.merriam-webster.com/dictionary/striding?show=0&t=1387342248

Meaning : This word was encountered when i read the story about the man about his experience walking from the airport in New York City. In the lines On that note, still striding briskly, he walked down into Manhattan and across Little Italy.

Now that i know what stride means it means that he was taking long steps while he was walking.