c'est

1. it is (used to define the preceding word)
2. it is (used to introduce a focus)
3. this is

la

• Article

  the (definite article)

• Pron
• Noun

concentration

1. concentration (mental state of being concentrated)
2. concentration (quality of being concentrated)

qui

• Pron

  1. who, whom
  2. who, whom (after a preposition), which, that

• Conj

est

• Adj

  east

• Noun
• Verb

utilisée

feminine singular of utilisé

dans la pratique

in practice, for all practical purposes

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