imaginary

/ˌɪˈmædʒəˌnɛri/B1Loopy word list, level 5 · Proficient

Definition

n. (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
adj. not based on fact; unreal

Word forms

Plural: imaginaries

Example sentences

a.
The imaginary friend helped her feel less lonely during her childhood.