pain

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An unpleasant sensation occurring in varying degrees of severity as a consequence of injury, disease, or emotional disorder.
2. n. Suffering or distress.
3. n. The pangs of childbirth.
4. n. Great care or effort: take pains with one's work.
5. n. Informal A source of annoyance; a nuisance.
6. v. To cause pain to; hurt or injure.
7. v. To be the cause of pain.
8. idiom. on Subject to the penalty of (a specified punishment, such as death).

Century Dictionary and Cyclopedia

1. n. Penalty; punishment suffered or denounced; suffering or evil inflicted as a punishment for a crime, or annexed to the commission of a crime.
2. n. Uneasiness or distress of body or of mind; bodily or mental suffering. That property of sensations or states of consciousness which induces in the sentient being an effort or a desire to suppress or be rid of them: the opposite of pleasure. Pain may have any degree of intensity, from the least perceivable to a maximum at or about which consciousness is destroyed. It may be local or general, physical or mental, or both together. In many sensations, as those produced by burns, the prick of a pin, or a colic, the element of pain is so predominant that such sensations are distinctively called pains.
3. n. Specifically — In the plural, the throes or distress of travail or childbirth.
4. n. Uneasiness of mind; mental distress; disquietude; anxiety; solicitude; grief; sorrow.
5. n. Labor; exertion; endeavor; especially, labor characterized by great care, or by assiduous attention to detail and a desire to secure the best results; care or trouble taken in doing something: used chiefly in the plural: as, to spare no pains to be accurate; to be at great pains or to take great pains in doing something. The form pains has been used by good writers as a singular, as in the quotation from Shakspere below.
6. n. Trouble; difficulty.
7. n. Synonyms Pain, Ache, Twinge. All the words expressing physical pain are applicable, by familiar and therefore not emphatic figure, to pain of mind. Pain is the general term; ache represents a continued local pain; it is often compounded with a word expressing the place, as headache, toothache. Twinge represents a sudden, momentary pain, as though one had been griped or wrung. See agony.
8. n. 2 . Bitterness, heartache, affliction, woe, burden.
9. To inflict suffering upon as a penalty or punishment; torture; punish.
10. To trouble or annoy with physical or mental suffering. To render physically uneasy; inflict physical pain upon; distress.
11. To render uneasy in mind; trouble or annoy with mental suffering; distress; disquiet; grieve.
12. To cause to take pains; put to exertion: used reflexively.
13. To put to trouble or pains.
14. Synonyms To hurt, agonize, torment, torture, rack, excruciate.
15. To suffer; be afflicted with pain.
16. n. Bread.
17. n. An obsolete spelling of pane.

Wiktionary

1. n. An ache or bodily suffering, or an instance of this; an unpleasant sensation, resulting from a derangement of functions, disease, or injury by violence; hurt.
2. n. The condition or fact of suffering or anguish especially mental, as opposed to pleasure; torment; distress; sadness; grief; solicitude; disquietude.
3. n. An annoying person or thing.
4. n. Suffering seen as a punishment or penalty.
5. n. bread
6. v. To hurt; to put to bodily uneasiness or anguish; to afflict with uneasy sensations of any degree of intensity; to torment; to torture.
7. v. To render uneasy in mind; to disquiet; to distress; to grieve.
8. v. To inflict suffering upon as a penalty; to punish.

GNU Webster's 1913

1. n. Punishment suffered or denounced; suffering or evil inflicted as a punishment for crime, or connected with the commission of a crime; penalty.
2. n. Any uneasy sensation in animal bodies, from slight uneasiness to extreme distress or torture, proceeding from a derangement of functions, disease, or injury by violence; bodily distress; bodily suffering; an ache; a smart.
3. n. Specifically, the throes or travail of childbirth.
4. n. Uneasiness of mind; mental distress; disquietude; anxiety; grief; solicitude; anguish. Also called mental pain.
5. n. See Pains, labor, effort.
6. v. To inflict suffering upon as a penalty; to punish.
7. v. To put to bodily uneasiness or anguish; to afflict with uneasy sensations of any degree of intensity; to torment; to torture
8. v. To render uneasy in mind; to disquiet; to distress; to grieve.

WordNet 3.0

1. n. a bothersome annoying person
2. n. something or someone that causes trouble; a source of unhappiness
3. n. a somatic sensation of acute discomfort
4. v. cause emotional anguish or make miserable
5. v. cause bodily suffering to and make sick or indisposed
6. n. emotional distress; a fundamental feeling that people try to avoid
7. n. a symptom of some physical hurt or disorder