The act of close or careful observing or listening, The ability or power to keep the mind on something; the ability to concentrate, a courteous act indicating affection

Used to greet someone, answer the telephone, or express surprise, A call for response if it is not clear if anyone is present or listening, or if a telephone conversation may have been disconnected, An expression of puzzlement or discovery, noun_ "Hello!" or an equivalent greeting, an expression of greeting

Present participle of monitor, noun_ The act of listening, carrying out surveillance on, and/or recording the emissions of one's own or allied forces for the purpose of maintaining and improving procedural standards and security, or for reference, as applicable, the act of observing something (and sometimes keeping a record of it), The act of detecting the presence of signals, such as electromagnetic radiation, sound, or visual signals, and the measurement thereof with appropriate measuring instruments

the act of hearing attentively, Action of the verb listening, Skill or ability for nonnatives of English language of perceiving spoken English, verb_ Present participle of listen