the
definite article
ðə 
ðə ði ði ðiː strong form ðiː 
1 used to refer to somebody/something that has already been mentioned or is easily understoodThere were three questions. The first two were relatively easy but the third one was hard.There was an accident here yesterday. A car hit a tree and the driver was killed.The heat was getting to be too much for me.The nights are getting longer.2 used to refer to somebody/something that is the only, normal or obvious one of their kindthe Mona Lisathe Nilethe QueenWhat's the matter?The phone rang.I patted her on the back.How's the (= your) baby?3 used when explaining which person or thing you meanthe house at the end of the streetThe people I met there were very friendly.It was the best day of my life.You're the third person to ask me that.Friday the thirteenthAlexander the Great4 used to refer to a thing in general rather than a particular exampleHe taught himself to play the violin.The dolphin is an intelligent animal.They placed the African elephant on their endangered list.I heard it on the radio.I'm usually out during the day.5 used with adjectives to refer to a thing or a group of people described by the adjectiveWith him, you should always expect the unexpected.the unemployedthe French6 used before the plural of somebody's last name to refer to a whole family or a married coupleDon't forget to invite the Jordans.7 enough of something for a particular purposeI wanted it but I didn't have the money.8 used with a unit of measurement to mean ‘every’My car does forty miles to the gallon.You get paid by the hour.9 used with a unit of time to mean ‘the present’Why not have the dish of the day?She's flavour of the month with him.10 ðiː ðiː Idioms
the more, less, etc…, the more, less, etc…
used to show that two things change to the same degree
The more she thought about it, the more depressed she became.The less said about the whole thing, the happier I'll be.