when - What does it mean?

Conjunction

(missing senses) (en-con)

At what time.

:

*

|title=(The Celebrity)|chapter=4 |passage=The Celebrity, by arts unknown, induced Mrs. Judge Short and two other ladies to call at Mohair on an afternoon when Mr. Cooke was trying a trotter on the track.

*

*:Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when , of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.

At such time as.

:

*{{quote-magazine|year=2013|month=July-August|author=(Henry Petroski)

|title= Geothermal Energy |volume=101|issue=4|magazine=(American Scientist) |passage=Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame. With more settled people, animals were harnessed to capstans or caged in treadmills to turn grist into meal.}}

As soon as.

:

At a time in the past.

:

*{{quote-news|year=2012|date=April 22|author=Sam Sheringham|work=BBC Sport

|title= Liverpool 0-1 West Brom |passage=The Baggies had offered little threat until the 28th minute, but when their first chance came it was a clear one.}}