Can we say the fusion of male and female gametes in ANIMALS is syngamy?

Syngamy of animal is the fusion of male and female gametes to form a diploid zygoye. This is otherwise called as fertilization or conception.

Fertilisation is the fusion of male and female gametes to give rise to a single cell – zygote. Fertilisation can be external fertilisation or internal fertilisation.
When male and female gametes unite outside the body, it is called external fertilisation
When fertilisation takes place inside the body, it is called internal fertilisation.
When fertilisation takes place in a test tube, the offspring are called test tube babies.
Fertilisation that takes place outside the human body is in-vitro fertilisation.

Zygote, the super cell marks the beginning of a new individual. The zygote divides repeatedly to form a ball of cells making an embryo.