The word for "الفجر" in English is dawn. It refers to the time of day when the first light appears in the sky before sunrise. Other words that can be used to describe dawn include daybreak, morning twilight, and the crack of dawn.
Here are some examples of how the word "dawn" can be used in a sentence:
The birds began to sing at dawn.
We hiked up the mountain at dawn to watch the sunrise.
The dawn sky was a beautiful mix of pink, orange, and purple.
The word "dawn" can also be used metaphorically to refer to a new beginning or a time of hope. For example, you might say that "a new dawn is on the horizon" to mean that things are looking up for the future.
I hope this helps! Let me know if you have any other questions.