preposition , conjunction , & adverb
- 1in the intervening period between (the time mentioned) and the time under consideration, typically the present: [as preposition]:she has suffered from depression since she was sixteen the worst property slump since the war I’ve felt better since I’ve been here [as adverb]:she ran away on Friday and we haven’t seen her since
late Middle English: contraction of obsolete sithence, or from dialect sin (both from dialect sithen 'thereupon, afterwards, ever since')
ConjunctionA subordinating conjunction used to introduce two types of adverbial clause: time:Since we moved here the asthma has got worse. reason:The Germans thought Danzig might be bombed but not Gdynia, since the latter is a Polish city. PrepositionIt is also used as a preposition:I haven’t seen her since Monday.