il

1. he (third-person singular masculine subject pronoun for human subject)
2. it (third-person singular subject pronoun for grammatically masculine objects)
3. Impersonal subject; it

est

• Adj

  east

• Noun
• Verb

de

• Prep

  1. of (expresses belonging)
  2. of (used to express property or association)
  3. from (used to indicate origin)
  4. of (indicates an amount)
  5. used attributively, often translated into English as a compound word
  6. from (used to indicate the start of a time or range)
  7. used after certain verbs before an infinitive, often translated into English as a gerund or an infinitive
  8. by (indicates the amount of change)

• Article
• Noun

descendre

1. to go down
2. to descend
3. to put down; disparage
4. (slang) to kill (someone)
5. to stay (in a hotel or other temporary lodging)

niveau

1. level (general)
2. level (measuring instrument)
3. level, the stage of a video game

dans

• Prep

  1. in, inside (enclosed in a physical space, a group, a state)
  2. to (indicates direction towards certain large subdivisions, see usage notes)
  3. in, within (a longer period of time)
  4. during
  5. out of, from
  6. in; in the works of
  7. (colloquial) Used in dans les (“about, around”)

• Noun

les

• Article

  1. plural of le: the
  2. plural of la: the

• Pron

bibliothèques

plural of bibliothèque