A period of 24 hours
Encoding Strategies:
linguistic
visual

diary
a daily record
Día means day and is related to the English word diary0, which is a daily record of events and experiences.0
día
day, daytime
A single unit of time lasting 24 hours, or just the light portion of the day
Prefiero trabajar de díaI prefer to work during the daytime
El viaje dura dos díasThe trip takes two days
hoy en día
nowadays, these days
This literally translates to something like "today, in this day (and age)." The article-less "en día" broadens things from a specific day to something more abstract, like "in the current day" or "in these times."
Hoy en día, todos tienen un teléfonoNowadays, everyone has a phone
Hoy en día es difícil encontrar trabajoThese days it's hard to find work
día a día
day by day (gradually),
daily life (routine)
Literally 'day to day' — repeating 'day' emphasizes routine repetition, giving the sense of gradual progress or everyday life.
Mejoro mi español día a díaI improve my Spanish day by day
El día a día puede ser agotadorDaily life can be exhausting
[something] del día
of the day, fresh
Literally 'of the day' — describes something freshly made today or currently featured.
¿Cuál es la sopa del día?What's the soup of the day?
El pescado del día es salmónToday's fresh fish is salmon
estar al día
to be up to date, to be current
Literally 'to be at the day' — if you've caught up to the present 'day,' you're fully current and informed.
Leo las noticias para estar al díaI read the news to stay up to date
¿Estás al día con tus pagos?Are you up to date on your payments?
buenos días
good morning, good day
Literally 'good days' — a standard greeting, used especially in the morning.