complex

C1 · Advanced Mathematics Technical

adj. related to a type of number that has both a real part and an imaginary part.

adj. pertaining to numbers of the form a + bi, where i is the square root of negative one.

“We learned how to plot complex numbers on a graph today.”

“The engineer used complex variables to model the fluid dynamics of the turbine blades under high pressure.”

B2 · Upper Intermediate Countable noun

n. a group of buildings or rooms that are close together and used for a similar purpose.

n. a whole structure or connected series of buildings or facilities.

“The new sports complex has a swimming pool and three gyms.”

“The industrial complex on the edge of the city houses several manufacturing plants and a central distribution warehouse.”

B2 · Upper Intermediate Countable noun Psychology

n. a group of feelings or worries that influence how someone behaves, often without them knowing it.

n. a related group of repressed mental networks that dominate a person's emotional life.

“He has a bit of a superiority complex and always thinks he is right.”

“Psychologists suggest that her childhood experiences contributed to an inferiority complex that manifests in her professional life.”

C1 · Advanced Countable noun Science Technical

n. a structure where a central atom is connected to other molecules.

n. a molecular entity formed by the loose association of two or more component molecules or ions.

“The scientist studied how the protein complex reacts to the new medicine.”

“The stability of the metal-ligand complex is highly dependent on the pH levels of the surrounding solution.”

C2 · Proficiency Science Technical

v. to join with another substance to form a single structure.

v. to form a complex with another substance; often used in biochemical contexts.

Español:complejizar

“The dye will complex with the fibers to create a permanent color.”

“The researchers observed the metal ions as they began to complex with the organic molecules in the sample.”