There are 2 definitions of Cs in English:

Cs1

Syllabification: Cs

symbol

The chemical element cesium.

Definition of Cs in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 2 definitions of Cs in English:

CS2

Line breaks: CS
Pronunciation: /siːˈɛs/

Entry from British & World English dictionary

abbreviation

British
1Chartered surveyor.
1.1Civil Service.
1.2Court of Session.

Definition of Cs in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up