Upper-Intermediate (B2)
IPA: /ˌmʌl.tɪˈlæt.ər.əl.i/
KK: /mʌlˈtɪlətərəli/
Definition
In a way that involves multiple parties or countries working together.
Example
The countries agreed to negotiate multilaterally to reach a common solution.
Conversation

Did you hear about the new agreement they reached?

Yeah, I heard they approached it multilaterally this time.

That's smart! It really helps to involve more countries in the discussion.

Absolutely, it can lead to better solutions for everyone.
Synonyms & Antonyms
Synonyms
jointly
collectively
cooperatively
Antonyms
unilaterally
individually
solely
Root Explanation
Multilaterally → It is formed from "multi-" (meaning many) and "lateralis" (from Latin, meaning side). The word "multilaterally" refers to actions or agreements involving many sides or parties.
Memory Tip
Think of 'many' ('multi-') sides ('lateralis') working together — that's what multilaterally means.
Visually Confused Words
unilaterally
trilaterally
equilaterally
unliterally
bilaterally