(idiomatic, slang) The time of occurrence of an event that will never happen.

(grammar) An auxiliary verb; a verb that accompanies the main verb in a clause.

(aviation) An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and typically having a smaller set of blades on its tail that stabilize the aircraft.

(transitive) To transport by helicopter. / (intransitive) To travel by helicopter. / To rotate like a helicopter blade. / To overprotect one's children, as a helicopter parent does.

A greeting (salutation) said when meeting someone or acknowledging someone’s arrival or presence. / A greeting used when answering the telephone.

"Hello!" or an equivalent greeting.

(transitive) To greet with "hello".

simple past tense and past participle of hold

Held in one or both hands. / Small and light enough to be operated while held in one or both hands.

(computing) A personal digital assistant or video game console that is small enough to be held in the hands.