0 involving a lot of different but related parts: --
a complex molecule/carbohydrate
a complex procedure
The company has a complex organizational structure.
It's a very complex issue to which there is no straightforward answer.
1 a large building with various connected rooms or a related group of buildings: --
2 a particular anxiety or unconscious fear that a person has, especially as a result of an unpleasant experience that they have had in the past or because they have a low opinion of their own worth: --
an inferiority complex
Don't go on about her weight - you'll give her a complex!
3 having many parts related to each other in ways that may be difficult to understand: --
4 a group of buildings that are related, or a large building having different parts: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.