| Term | Definition |
| meteor | nc \ a piece of rock or other matter from space that produces a bright light as it travels through the Earth's atmosphere |
| meticulous | adj \ very careful and with great attention to every detail |
| mingle | vi/t with \ mix or combine, or be mixed or combined; move around and talk to other people at a social event |
| modify | vt \ change something such as a plan, opinion, law or way of behaviour slightly, usually to improve it or make it more acceptable |
| molest | vt \ touch or attack someone in a sexual way against their wishes; touch, push, etc. someone violently |
| monstrous | adj \ very bad or cruel |
| moron | nc \ a very stupid person |
| morsel | nc of \ a very small piece of food; a very small piece or amount |
| mumble | vi/t +"" \ speak unclearly and quietly so that the words are difficult to understand |
| munch | vi/t on \ eat something, especially noisily |
| mutual | adj \ (of two or more people or groups) feeling the same emotion, or doing the same thing to or for each other |
| nadir | nc of \ the worst moment, or the moment of least hope and least achievement |
| nasty | adj \ bad or very unpleasant; unkind; dangerous or violent; rude or offensive |
| negligent | adj in \ not being careful or giving enough attention to people or things that are your responsibility |
| numb | adj with/ vt \ paralyzed; not able to feel any emotions properly or to think clearly, because you are so shocked or frightened, etc/ make something or someone feel numb |
| oasis | nc of / a place in a desert where there is water and therefore plants and trees and sometimes a village or town; a calm, pleasant place in the middle of somewhere busy and unpleasant |
| oblivion | nu into+ \ the state of being unconscious; the state of being completely forgotten; the state of being completely destroyed |
| oblivious | adj of/to \ not aware of something, especially what is happening around you |
| obscure | adj \ not known to many people; unclear and difficult to understand or see |
| obsequious | adj \ too eager to praise or obey someone |
| obsolete | adj \ not in use any more, having been replaced by something newer and better or more fashionable |
| obstinate | adj \ unreasonably determined, especially to act in a particular way and not to change at all, despite argument or persuasion; describes a problem, situation or thing that is difficult to deal with, remove or defeat |
| obstruct | vt \ to block a road, passage, entrance, etc. so that nothing can go along it, or to prevent something from happening correctly by putting difficulties in its way; try to stop something from happening or developing |
| ominous | adj \ suggesting that something unpleasant is likely to happen |
| omit | vt from, inf / fail to include or do something |
| oration | nc \ a formal public speech about a serious subject |
| orchard | nc \ an area of land where fruit trees (but not orange trees or other citrus trees) are grown |
| ordeal | nc \ a very unpleasant and painful or difficult experience |
| output | nu \ an amount of something produced by a person, machine, factory, country, etc |
| outrageous | adj \ shocking and morally unacceptable; describes something or someone that is shocking because they are unusual or strange |
| overall | adj \ in general rather than in particular, or including all the people or things in a particular group or situation |
| pact | nc inf \ a formal agreement between two people or groups of people |
| palatable | adj \ describes food or drink that has a pleasant taste; acceptable |
| pauper | nc \ a very poor person |
| peek | vi \ look, especially for a short time or while trying to avoid being seen; stick out slightly and be partly seen |
| penetrate | vi/t \ move into or through something; If your eyes penetrate dark surroundings, you manage to see through them |