a painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder
acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
a courteous act indicating affection; "she tried to win his heart with her many attentions"
a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review; "the troops stood at attention"
the faculty or power of mental concentration; "keeping track of all the details requires your complete attention"
the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others
a general interest that leads people to want to know more; "She was the center of attention"
the process of ionizing; the formation of ions by separating atoms or molecules or radicals or by adding or subtracting electrons from atoms by strong electric fields in a gas
the condition of being dissociated into ions (as by heat or radiation or chemical reaction or electrical discharge); "the ionization of a gas"