un

• Article

  a, one

• Num

día

1. day (24 hours)
2. period of light, when the sun is above the horizon

estou

first-person singular present indicative of estar

en

• Prep

  1. in
  2. when preceding a verb or a complement of a verb it can denote an unfinished or continued action

• Adv

plana

feminine singular of plano

e

• Conj

  and

• Character
• Noun

ao

Contraction of a o (“to the, towards the”).

seguinte

next, following