The Spanish term "inmigracion al dia" translates to English roughly as "immigration per day" or "immigration a day," according to Online-Translator.com. "Al" is a Spanish participle that can mean "to" or "on," so it roughly means "on the day of" in the context of the phrase translated.
Immigration is defined by Dictionary.com as the act of a person or multiple people moving to a country of which they are not a native. It can also refer to an the act of an organism passing through or relocating to a new habitat. Both the Spanish and English words for "immigrate" originate from the Latin word "immigrātus." "Immigrate" first came into usage in the early 17th century.