既是

jìshì
  1. is both ...(and...)
  2. since
  3. as
  4. being the case that

CEDICT

  1. (literary) since; as; being that
  2. since; as; being that

Wiktionary

连词。通常用在上半句话的句首，表示前提，后再加以推论。《水浒传》第三三回：「既是恁地，却容易。」《二十年目睹之怪现状》第二二回：「要参他功名，既是无隙可乘，又咽不下这口恶气。」也作「既然」。

重編國語辭典

Entry Composition

1 既 jì
  1. already
  2. since
  3. both... (and...)
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì

Related entries

以来 yǐlái since (a previous event)
我去年以來就沒再做了。

I haven't done that since last year.

Source: Tatoeba

以降 yǐjiàng since (some point in the past)
自从 zìcóng
  1. since (a time)
  2. ever since
自从我认识她的时候，我就恨她。

From the moment that I met her, I hated her.

Source: Tatoeba

自打 zìdǎ (coll.) since
打从 dǎcóng
  1. from
  2. (ever) since
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