Arrange the following words as per their order in the English dictionary and choose the one that comes first :
$$\text{Elastic; Eldorado; Ejaculate; Electrode}$$

Let's compare the words letter-by-letter to find their alphabetical dictionary order:
All words start with the letter 'E'. Let's look at the second letter:

* Elastic $\to$ 'l'
* Eldorado $\to$ 'l'
* Ejaculate $\to$ 'j'
* Electrode $\to$ 'l'

Comparing the second letters ('l' and 'j'), alphabetically 'j' comes before 'l'.
Therefore, Ejaculate will be the very first word among the four in the English dictionary.