C#

public class Definition
{
    public Definition(string meaning, string pronoun)
    {
        Meaning = meaning;
        Pronoun = pronoun;
    }
    public string Meaning { get; private set; }
    public string Pronoun { get; private set; }
}

Dictionary<string, Definition> definitions = new Dictionary<string, Definition>();
public void AddDefinition(string word, string meaning, string pronoun)
{
    definitions.Add(word, new Definition(meaning, pronoun));
}
// other methods here...

DateTime startDate = DateTime.Today;
startDate.Hour = startHour;
startDate.Minute = startMinute;

TimeSpan interval = new TimeSpan(intervalHour, intervalMinute, 0);

Timer timer = new Timer(MyTimerCallback, null, startDate - DateTime.Now, interval);