Meaning of CONDITIONAL in English

CONDITIONAL

I. con ‧ di ‧ tion ‧ al 1 /kənˈdɪʃ ə nəl/ BrE AmE adjective

[ Word Family: noun : ↑ condition , ↑ precondition , ↑ conditioner , ↑ conditioning ; verb : ↑ condition ; adverb : ↑ conditionally ≠ ↑ unconditionally ; adjective : ↑ conditional ≠ ↑ unconditional ]

1 . if an offer, agreement etc is conditional, it will only be done if something else happens first OPP unconditional :

a conditional acceptance

conditional on/upon

His agreement to buy our house was conditional on our leaving all the furniture in it.

2 . in grammar, a conditional sentence is one that begins with ‘if’ or ‘unless’ and expresses something that must be true or happen before something else can be true or happen

—conditionally adverb

II. conditional 2 BrE AmE noun [countable]

a sentence or ↑ clause that is expressed in a conditional form

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.