Elapse v. i. : To slip or glide away; to pass away silently, as time; -- used chiefly in reference to time.

Example:
How many seconds will Elapse between seeing lightning and hearing the thunder if the lightning strikes 1mile a

Taxonomy
elapse, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, intransitive verb, glossary, english, language, ESL, laps, Inflected, elaps, Etymology, Latin, past participle, elabi.

Defination from the web:
elapse from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Inflected Form(s): elapsed; elaps·ing. Etymology: Latin elapsus, past participle of elabi, from e- + labi to slip — more at sleep. Date: 1644 : ...