Keyword Analysis & Research: what does since mean in a sentence

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does since mean in a sentence	0.75	0.6	3195	41	34
what	0.43	1	3910	76	4
does	1.17	0.5	5324	9	4
since	0.91	0.6	2668	27	5
mean	2	0.2	5337	84	4
in	0.1	0.1	654	1	2
a	1.46	0.7	4847	18	1
sentence	0.26	0.2	9767	72	8

Keyword	CPC	PCC	Volume	Score
what does since mean in a sentence	1.45	0.8	6592	46