1-someone you know, but who is not a close friend.She was a casual acquaintance of my family in Vienna. 2-a relationship with someone you know, but who is not a close friend.They developed an acquaintance over the Internet. 3-An acquaintance is someone you know a little about, but they’re not your best friend or anything.

1-someone who is sociable is friendly and enjoys being with other people; a sociable person is friendly and enjoys being with other people. I wish he were a more sociable person. Young children with imaginary friends are often described as sociable.
2-encouraging communication, bringing people together. This square is the social centre of a very sociable little village.

Until a stage is reached or is near; up until; right until; as far as. Some children are bullied to the point of suicide. His behaviour was strange to the point of being considered unacceptable by his employers. British industry was driven to the point of collapse.

Needing to be discussed or dealt with very soon; Requiring quick or immediate action or attention; inflation was the most pressing problem. Poverty is a more pressing problem than pollution. I felt that it was the most pressing sort of social public work to be done in the country.

someone who works hard doing practical things to achieve social or political change Several peace activists were arrested at the demonstration.

to think very carefully about something that you are doing Be quiet — let me concentrate on my homework. Doctors are aiming to concentrate more on prevention than cure. Once you have control over the words you can concentrate all your efforts on their meaning.

1-so good that it should not be missed a movie, play, etc. that is unmissable is so good that you think everyone should see it.
2-so clear or obvious that it cannot be missed Her bright orange hair was unmissable in a crowd.

an account of the achievement of success, fortune, or fame by someone or some enterprise. The company was one of the success stories of the 1990s. Angela Black's biscuit company is a rare success story in these times of recession.

to study about someone or something thoroughly. I decided that I would research into Queen Elizabeth. We researched into the period in which she lived. Ten years ago I began researching into the role of women in trade unions.

to increase the range of things that someone knows about, has experienced, or is able to do.
This trip to the Far East has certainly broadened our family's horizons. I'd like to work abroad to broaden my horizons.

occasionally; sometimes, but not often or regularly.
I still see her every now and then.